Patent Publication Number: US-7724902-B2

Title: Faceplate for quick removal and securing of encryption device

Description:
The present application claims priority from and is a continuation of U.S. application Ser. No. 11/008,596, entitled “Reach-Back Communications Terminal With Selectable Networking Options”, filed Dec. 10, 2004; which in turn claims priority from U.S. Provisional Application Ser. No. 60/553,547, entitled “Portable Remote Access Reach-Back Communications Terminal”, filed Mar. 17, 2004. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates generally to computer and communication networks. More specifically, it relates to a portable reach-back communications system that provides extremely flexible secure or non-secure voice, video and data services to a remote user. 
     2. Background of the Related Art 
     In 1970, the Secure Telephone Unit (STU-I) was developed, followed in 1975 by the STU-II, and finally in 1987 by the third generation STU-III. 
     The STU-III terminals are designed to operate as either an ordinary telephone or a secure instrument over a dial-up public switched telephone network (PSTN). The STU-III operates in full-duplex over a single telephone circuit using echo canceling modem technology. Typically, STU-IIIs come equipped with 2.4 and 4.8 kbps code-excited linear prediction (CELP) secure voice. Secure data can be transmitted at speeds of 2.4, 4.8 and 9.6 kbps, though data throughput between two STU-IIIs is only as great as the slowest STU-III. 
     A STU-III operates by taking an audio signal and digitizing it into a serial data stream, which is then mixed with a keying stream of data created by an internal ciphering algorithm. This mixed data is then passed through a COder-DECoder (CODEC) to convert it back to audio so it can be passed over the phone line. STU-IIIs also allow a serial data stream to pass through the phone and into the ciphering engine to allow its usage as an encrypted modem when not used for voice. 
     The keying stream is a polymorphic regenerating mathematic algorithm which takes an initialization key and mathematically morphs it into a bit stream pattern. The keying stream is created by the key generator, and is the heart of the STU-III. A portion of the keying stream is then mixed back into the original key, and the process is repeated. The result is a pseudo-random bit stream that if properly implemented is extremely difficult to decrypt. Even the most sophisticated cryptographic algorithm can be easily expressed in the form of a simple equation in Boolean algebra, with the initialization keys being used to define the initial key generator settings, and to provide morphing back to the equation. 
     While STU-III provides secure communications, audio quality was vastly improved with the development of purely digital Standard Telephone Equipment (STE) devices. 
     An STE device utilizes an ISDN digital telephone line connection. There is substantial improvement in voice quality using an STE as opposed to the STU-III used over analog telephone lines. Most STE devices are STU-III secure mode compatible with enhanced abilities including voice-recognition quality secure voice communication, and high-speed secure data transfers (up to 38.4 kbps for asynchronous or 128 kbps for synchronous data transfers). When connected to an analog telephone line, an STE unit will only support STU-III voice and data capabilities. 
     The STU-III and STE are quite useful in fixed use, i.e., in an office environment or perhaps carried to another location having access to analog or digital telephone line access. 
       FIG. 18  is a depiction of a conventional fragmented secure communications network. 
     In particular, as shown in  FIG. 18 , a network backbone  1800  allows various like devices to securely connect to each other. The network backbone  1800  includes such communication networks as ISDN TDM, ATM and IP. Devices that can connect to the network backbone  1800  include an ISDN telephone  1810 , a voice-over-IP computer terminal  1820 , a voice-over-IP telephone  1830 , TRI-TAC &amp; MSE devices  1840 , cellular telephones  1850 , communicating using various standards including CDMA, GSM, TDMA and iDEN. Other devices that can connect to the network backbone  1800  include tactical digital radios  1850 , analog cellular telephones  1860 , satellite communications  1870 , a dial-up computer terminal  1880 , and a public switched telephone network telephone  1890 . 
     In operation, each of the devices transmitting data to the network backbone  1800  must encrypt their respective data streams. Each of the devices receiving data from the network backbone  1800  must un-encrypt their respective data streams. 
     A conventional vocoder for use with the network backbone  1800  is the Mixed-Excitation Linear Predictive (MELP) vocoder. THe MELP vocoder is a dual-rate low rate coder that operates at 1200 bits-per-second (bps) and 2400 bps. The MELP vocoder meets military standard MIL-STD-3005 and NATO STANAG 4591. 
     FNBDT (Type 1 Future NarrowBand Digital Terminal) is an acronym that corresponds to Digital Secure Voice Protocol (DSVP) transport layer and above. DSVP operates over most data and voice network configurations with a Least Common Denominator for interoperability. DSVP interoperates with many media including wireless, satellite, IP and cellular. DSVP adapts to the data rate of the connection, with modems training down. DSVP negotiates security/application features with application to point-to-point communications and multi-point communications. DSVP supports realtime, near realtime and non-realtime applications. 
       FIG. 19  is a depiction of a conventional combination wired and wireless communication network supporting secure communications. Secure operation requires wireless circuit switched data service and use of a data telephone number. 
     In particular, as shown in  FIG. 19 , a combination wired and wireless communication network comprises various analog and digital communication networks  1900 , such as PSTN  1901 , analog communication networks  1902  and digital communication networks  1903 . Devices connecting to the various analog and digital communication networks  1900  include mobile satellite service devices  1910  connecting to a satellite service  1911 , e.g., Iridium, Globalstar and ICO. The mobile satellite service devices  1910  communicate through a Iridium satellite system. Further devices connecting to the various analog and digital communication networks  1900  include STE  1920 , digital cellular telephones  1930  using, e.g., GSM standards, digital cellular telephones  1940  connecting to a CDMA network. A tactical MSE/TRI-TAC network  1950  allows various devices to connect to the various communication networks  1900 . Devices connecting to the tactical MSE/TRI-TAC network  1950  are, e.g., JTR  1952 , deployable LMR  1954  and cellular tactical STE  1956 . The tactical MSE/TRI-TAC network  1950  can connect to a CDMA network. A STU-III  1970  and analog cellular telephone  1972 , e.g., CipherTAC 2000, connect to the analog network  1902 . 
     In operation, CDMA communications occur at 800 Mhz over CONUS approved networks, such as Verizon and ALLTEL. GSM communications occur at 850 Mhz and 1900 Mhz over CONUS approved networks, such as T-Mobile and AT&amp;T. OCONUS European GSM 900 MHz and 1800 MHz, many are approved based on commercial approval of TimeportII GSM phone within SECTERA-GSM secure terminal. 
     Any of the communication devices of  FIG. 19  can obtain a secure voice connection with any secure, like communication device. 
       FIG. 20  is a depiction of a conventional deployable secure communication system utilizing a satellite communication network. 
     In particular, as shown in  FIG. 20 , a secure encryption STE  700  with suitable interface hardware is utilized to provide a connection path to a wireless connection to a similarly secure STE via a satellite transceiver  914 , e.g., an Inmarsat M4 terminal. In the conventional system of  FIG. 20 , an ISDN link is utilized between the STE  700  and a suitable satellite two-way communication transceiver and antenna  914 . 
     In operation, voice data is encrypted by the STE  700 , and transmitted in a secure environment over a physically secure satellite, e.g., the M4 INMARSAT satellite transceiver  914 . 
     It is vitally important that the STE  700  stay physically secured, to maximize protection of the information being passed thereover. Also, to further maximize protection of the information, the satellite transceiver  914  is conventionally set up and maintained within a secure environment, and usually travels with the STE  700 . 
     Conventional systems are typically physically large, e.g., the size of a van. More importantly, such conventional systems require all elements to be maintained in a secure environment, including the data transport system (e.g., satellite communication system) over which the data travels to another secure communications terminal. Such secure data transport systems are costly to install and maintain, and always run a risk of being compromised. 
       FIG. 21  is a depiction of a conventional CDMA to GSM secure call setup. 
     In particular, before two-party secure voice traffic starts, FNBDT Call Setup Application messages are exchanged using an FNBDT Application Reliable Transport and Message Layer Protocols. 
       FIG. 22  is a depiction of a conventional FNBDT example call. 
     In particular, FNBDT secure voice &amp; data may be sent over may network segments. The connection shown use CDMA, PSTN and GSM networks. 
     The prior art uses a plurality of different devices, one for connection to each network that a user desires to connect with. Thus, there is a need for a small, lightweight, easily portable and easily deployable communication system that is not only even more secure than conventional systems, but which also allows flexibility in use of non-secure data transport systems. 
     Such conventional secure systems are typically physically large but more importantly allow for only direct secure connection communication between a remote user and a like receiver to maintain security in the communications. While this is quite useful in many situations, only limited communications are possible in a direct connection. For instance, direct, secure connectivity does not also allow access to non-secure public communication systems, e.g., the Internet. 
     There is a need for a small, lightweight, and extremely flexible and adaptable communications terminal capable of quick, convenient and easy use with a multitude of network environments, and for a deployable communication system that is not only more secure than conventional systems, but which also allows flexibility in use of non-secure data transport systems. 
     SUMMARY OF THE INVENTION 
     In accordance with the principles of the present invention, a reach-back communications terminal comprises a telephone, and an interface to connect the telephone to a communications network. An encryption communications device is operable to encrypt a path between the telephone and the interface. A personality faceplate in a case holds the encryption communications device. The personality faceplate is removably connectable to the reach-back communications terminal to allow easy and quick user removal of the encryption communications device. 
     A method of providing easily secured encryption in a reach-back communications device in accordance with another aspect of the present invention comprises providing a communications path through an encryption communications device to a communications network. A user-removable personality faceplate is provided in a case holding the reach-back communications device. The user-removable personality faceplate includes the encryption communications device and is quickly removed from the reach-back communications device allowing a user of the encryption communications device to quickly remove and secure the encryption communications device via the user-removable personality faceplate without also requiring the user to physically secure a non-secure communications portion of the reach-back communications device. 
     In accordance with yet another aspect of the invention, an improvement in a reach-back communications terminal including encryption capability includes a GSM cellular telephone enclosed by the reach-back communications terminal. The GSM cellular telephone is adapted to pass information through an encryption device in the reach-back communications terminal. A subscriber identity module (SIM) is adapted for regular insertion and removal by a user from the GSM cellular telephone inside the reach-back communications terminal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a combination wired and wireless communication network supporting secure communications including a reach-back communications network, in accordance with the principles of the present invention. 
         FIG. 2A  shows a front panel view of the reach-back communications terminal, in accordance with the principles of the present invention. 
         FIG. 2B  shows a top panel view of the reach-back communications terminal, in accordance with the principles of the present invention. 
         FIG. 2C  shows a top/rear view of the reach-back communications terminal, in accordance with the principles of the present invention. 
       FIG.  2 D( 1 ) shows a rear cut-away view of the reach-back communications terminal, in accordance with the principles of the present invention. 
       FIG.  2 D( 2 ) shows a base cut-away view of the reach-back communications terminal, in accordance with the principles of the present invention. 
         FIG. 3  shows an exemplary configuration for a reach-back communications terminal configured for access to a WAN, in accordance with the principles of the present invention. 
         FIG. 4  shows the reach-back communications terminal set up to establish voice communications through a PSTN network, in accordance with the principles of the present invention. 
         FIG. 5  shows the reach-back communications terminal set up to establish data communications through a PSTN network, in accordance with the principles of the present invention. 
         FIG. 6  shows the reach-back communications terminal set up to establish voice communications through a PBX network, in accordance with the principles of the present invention. 
         FIG. 6A  depicts a digital PBX connection with a PBX base unit, the handset of the PBX base unit, and a PSTN common bus/circuit switch connected in turn to an encryption unit, in accordance with the principles of the present invention. 
         FIG. 7  shows the reach-back communications terminal set up to establish data communications through a PBX network, in accordance with the principles of the present invention. 
         FIG. 8  shows the reach-back communications terminal set up to establish voice communications through a GSM network, in accordance with the principles of the present invention. 
         FIG. 9  shows the reach-back communications terminal set up to establish non-secure data communications through a GSM network, in accordance with the principles of the present invention. 
         FIG. 10  shows the reach-back communications terminal set up to establish secure data communications through a GSM network, in accordance with the principles of the present invention. 
         FIG. 11  shows the reach-back communications terminal set up to establish IP voice communications over an IP network, in accordance with the principles of the present invention. 
         FIG. 12  shows the reach-back communications terminal set up to establish IP data communications over an IP network, in accordance with the principles of the present invention. 
         FIG. 13  shows the reach-back communications terminal set up to establish WiFi voice communications over a WiFi network, in accordance with the principles of the present invention. 
         FIG. 14  shows the reach-back communications terminal set up to establish WiFi data communications over a WiFi network, in accordance with the principles of the present invention. 
         FIG. 15  shows the reach-back communications terminal set up to establish satellite voice communications over a satellite network, in accordance with the principles of the present invention. 
         FIG. 16  shows the potential data rates for the different types of communication networks available with use on the reach-back communication terminal, in accordance with the principles of the present invention. 
         FIG. 17  shows keys available on the personality faceplate keypad, in accordance with the principles of the present invention. 
         FIG. 18  shows a conventional fragmented secure communications network. 
         FIG. 19  shows a conventional combination wired and wireless communication network supporting secure communications. 
         FIG. 20  shows a conventional deployable secure communication system utilizing a satellite communication network. 
         FIG. 21  shows a conventional CDMA to GSM secure call setup. 
         FIG. 22  shows a conventional FNBDT example call. 
     
    
    
     DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS 
     The communications terminal disclosed herein is an extremely portable and fully capable remote access communications terminal ideal for reach-back secure communications over any of many network options, and other uses. Extending the reach of a headquarters&#39; voice, data and video network services, a reach-back communications terminal as disclosed herein offers key benefits. For instance, high availability and reliable connectivity are provided, as are total access to vital resources, and secure extension to the home office. Moreover, a reach-back communications terminal as disclosed herein allows a user to select a lowest cost network routing option from among multiple possible network options. 
     The disclosed reach-back communications terminal is a remote communications terminal that enables highly available connections back to a headquarters network, delivering dependable access to mission-critical personnel and information. Integrated components simplify access to varied networks allowing deployed users to select and connect quickly to a network that best supports their present mission. 
     The disclosed reach-back communications terminal provides immediate and secure access. For example, first responders require secure, readily-available voice, data and video communications. The reach-back communications terminal disclosed herein enables fast and secure connectivity to multiple telecommunications networks. Security is guaranteed with Type 4 encryption or optional NSA Type 1 encryption. As part of a system solution, reach-back communications terminal home stations provide end-to-end reach-back networking to infrastructure and services. For US government users, the reach-back communications terminal enables remote connections to secure networks, e.g., to SIPRNET or NIPRNET. 
     Type 1 encryption may include L-3 OMNIxi, General Dynamics Sectera (Omega) and Sectera Wireline. Type 4 encryption includes General Dynamics TalkSecure (AES). The reach-back communications terminal preferably also implements Type 1 Future NarrowBand Digital Terminal (FNBDT) signaling and cryptography specifications as defined by the U.S. Government. Non-Type 1 cryptography includes standard P224 Elliptic Curve Cryptography (ECC) identified in FIPS 186-2. 
     The reach-back communications terminal implements Type 1 cryptography by implementing Type 1 FNBDT signaling and cryptography specifications as defined by the U.S. Government. 
     The reach-back communications terminal implements non-Type 1 cryptography using standard P-224 Elliptic Curve Cryptography (ECC), identified FIPS 186-2, to derive a pair-wise, unique session key. ECC provides a higher security strength than RSA for a given key length and increases as the key length grows. For example, a 160-bit ECC key is equivalently secure to a 1024-bit RSA key, a 224-bit ECC key is more secure than a 2048-bit RSA key, and a 320-bit ECC key is equivalently secure to a 5120-bit RSA key. 
     During secure call setup, the reach-back communications terminal exchanges public keys with the remote terminal using FNBDT signaling. Traffic encryption is performed using the NIST approved Advanced Encryption System (AES) standard (Rijndael) and a 128-bit random key (2^128 possible keys). 
     The disclosed reach-back communications terminal is housed in an easily portable and lightweight casing, e.g., weighing less than 15 pounds in the disclosed embodiments. Easy terminal set up takes three minutes or less, and users plug in their own, familiar laptop for direct system access. For ease of portability, the reach-back communications terminal  100  may be associated with a carrying case, e.g., computer-style and ruggedized. 
       FIG. 1  is a depiction of a combination wired and wireless communication network supporting secure communications including a reach-back communications network  100 , in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 1 , a combination wired and wireless communication network comprises various analog and digital communication networks  1900 , such as PSTN  1901 , analog communication network  1902  and digital network  1903 . Devices connecting to the various digital communication networks  1900  include mobile satellite service devices  1910  connecting to a satellite service  1911 , e.g., Iridium, Globalstar and INMARSAT Mini-M. Further devices connecting to the various digital communication networks  1900  include an encryptor  1920  (e.g., an FNBDT encryptor), digital cellular telephones  1930  using, e.g., GSM communication standards and digital cellular telephones  1940  connecting to a CDMA network. 
     In accordance with the principles of the present invention, the disclosed reach-back communication terminals  100  are able to obtain a secure connection with any of the other communication devices of  FIG. 1 , including with each other, thus providing a flexible cross-network secure communications channel between like or differing user devices. Exemplary network communication paths include a satellite service  1911 , a GSM cellular network, and a CDMA cellular network. 
       FIG. 2A  shows a front panel view of an exemplary reach-back communications terminal  100 , in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 2A , the reach-back communications terminal  100  is comprised of a network selector switch  110 , status indicator lights  120 , an IP Config port  123 , a PSTN port  125 , an Ethernet/WiFi Config port  130 , a secure data OUT port to a satellite transceiver port (SDOS)  150 , a PBX handset port  162 , a PBX Control switch  165 , a PBX base port  174 , an unsecured GSM/GPRS data port  180 , a power button  192 , and a DC power-in connector  194 . 
     Two antenna, antenna  152  and antenna  154 , although preferably connected to the back of the reach-back communications terminal  100  are viewable from the front panel view of the reach-back communications terminal  100 . Antenna  152  and antenna  154  allow transmission to and reception from a cellular telephone network, e.g., a GSM network, and a wireless fidelity (WiFi) network, respectively. 
     The power button  192  is used to activate internal circuitry within the reach-back communications terminal  100 . The AC/DC power supply  182 , shown in  FIG. 4 , is connectable to an AC power source  184 , e.g., a conventional wall outlet, in the exemplary embodiments. Power provided by the AC power source  184  (e.g., 110/220V, 50/60 Hz) is converted to 12V DC by the AC/DC power supply  182  for connection to the DC power-in connector  194 . 
     Alternately, a DC power source (e.g., a 12V battery pack) can be used as a power source. The DC power source, not shown, is preferably external to the housing of the reach-back communications terminal  100  to facilitate streamlined autonomy from external-power sources, though an internal DC power source is within the principles of the invention. Preferably, universal power inputs/battery packs are utilized to allow for un-tethered operations and ease of replacing components. 
     Network selector switch  110  allows a user of the reach-back communications terminal  100  the flexibility to choose one of a plurality of data communications networks and voice communications networks. Data communications and voice can occur over any available network, e.g., Public Switched Telephone Network (PSTN), Private Branch Exchange (PBX), Global System for Mobile communications (GSM), satellite (SAT), Internet Protocol (IP) or WiFi. 
     The status indicator lights  120  allow an operator of the reach-back communications terminal  100  a visual verification of selection of the desired data communications circuitry and voice communications circuitry within the reach-back communications terminal  100 , and a visual indication of an available signal on the selected data communications network and voice communications network. 
     IP Config port  123  is a non-secure connection point for a personal computer to connect to and configure the reach-back communications terminal  100  with a static IP address. For example, in instances where a dynamic address is unobtainable from a network connection, a static address will be assigned to the reach-back communications terminal  100  by an application executed on a personal computer connected to the IP Config port  123 . 
     Ethernet/WiFi Config port  130  serves a dual purpose. Ethernet/WiFi Config port  130  is a non-secure connection point for a personal computer to connect to the reach-back communications terminal  100  to configure a WiFi connection. Alternately, a menu option on the personality faceplate  145  can be used to configure the reach-back communications terminal  100  for connection to a WiFi network. Ethernet/WiFi Config port  130  is used to connect the reach-back communications terminal  100  to a wired LAN. 
     The unsecured GSM/GPRS data port  180  allows users of the reach-back communications terminal  100  unencrypted access to a GSM/GPRS network if desired. Any device with the proper connector, such as a PDA or personal computer can be connected to the unsecured GSM/GPRS data port  180  to allow that device unsecured access to a GSM network and a GPRS network. 
     SDOS port  150  allows users of the reach-back communications terminal  100  a secure connection to a compatible satellite device. Any devices with a compatible connector, such as a satellite telephone and an Inmarsat M4 terminal, can be connected to the SDOS port  150  to allow the reach-back communications terminal  100  access to a satellite network. 
     PSTN port  125  allow the reach-back communications terminal  100  to be connected to a PSTN network. 
     PBX handset port  162  and PBX base port  174  allow respectively a handset from a conventional telephone and a handset port from a conventional telephone to be connected to the reach-back communications terminal, as shown in  FIG. 6 . 
     The PBX control switch  165  is used to switch internal circuitry within the reach-back communications terminal  100  between different modes corresponding to different types of PBX systems. The inventors have determined that there are essentially four predominant, different PBX types commonly found currently in use. Of course, other types of PBX systems may be implemented, perhaps requiring a switch  165  having additional positions, within the scope of the present invention. 
     For example, after a user connects the reach-back communications terminal  100  to a PBX wall plate  320 , shown in  FIG. 6 , the integrated telephone handset  176 , shown in  FIG. 2B , may be picked up to listen for a dial tone. If no dial tone is audible, the PBX control switch  165  may be moved to another designated position until an audible dial tone is available. An audible dial tone indicates that the PBX control switch  165  is at a position of compatibility for a particular PBX network that the reach-back communications terminal  100  is currently connected to. 
     Likewise, network selector switch  110  is rotatable through six positions PSTN, PBX, GSM, SAT, IP and WIFI. The six positions, i.e., PSTN, PBX, GSM, SAT, IP and WIFI, correspond respectively to: PSTN communications using PSTN port  125 ; PBX communications using PBX base port  174 ; GSM communications using GSM antenna  152 ; SAT communications using SDOS  150 ; IP communications using Ethernet port  130 ; and WiFi communications using WiFi antenna  154 . 
     For example, as shown in  FIG. 2A , network selector switch  110  may be rotated with an indicator pointing to PSTN communications to select communications over a public switched telephone network (PSTN). With the network selector switch  110  pointing to PSTN communications, the reach-back communications terminal  100  is configured to access a PSTN through PSTN port  125 . 
       FIG. 2B  shows a top panel view of the reach-back communications terminal  100 , in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 2B , the reach-back communications terminal  100  further comprises a personality faceplate keypad  146 , a personality faceplate  145 , a personality faceplate display  147 , an integrated telephone handset  176  and an integrated telephone handset keypad  175 , 
     The integrated telephone handset  176  and integrated telephone keypad  175  are used as conventional telephone handsets and telephone keypads in conducting telephone conversations and dialing a destination telephone number. Calls using the integrated telephone handset  176  are capable of NSA Type 1 or Type 4, AES encryption using the encryption circuitry within the personality faceplate  145 . 
     The personality faceplate  145  contains the necessary encryption circuitry for the reach-back communications terminal  100 , fitting into a mounting area cut for the particular encryption device used (i.e., an FNBDT encryptor). The personality faceplate  145  includes a personality faceplate keypad  146  for data entry and a personality faceplate display  147  for allowing a user to visually interface with menu options available on the personality faceplate  145 . 
     The personality faceplate  145  is removably connected to the reach-back communications terminal  100  for convenient replacement with an alternate encryption FNBDT encryptor. Moreover, in the event that the reach-back communications terminal  100  is used in a situation where a user must protect the personality faceplate  145  from being confiscated, the personality faceplate  145  is easily removable for destruction and/or portability. 
       FIG. 2C  shows a top/rear view of the reach-back communications terminal  100 , in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 2C , the reach-back communications terminal further comprises a port for connecting secure data from a PC (SDIPC)  140 . The SDIPC port  140  is conveniently located on the back of the reach-back communications terminal for interconnectivity with, e.g., a desktop computer, a laptop computer, handheld computers, digital cameras, etc. Preferably, the SDIPC port  140  is an RS-232 serial port. Although an RS-232 serial port is preferable, one of ordinary skill in the art would recognize that the reach-back communications terminal  100  can utilize any of a plurality of computer interfaces without departing from the scope of the invention, e.g., a USB-port. 
     FIG.  2 D( 1 ) shows a rear cut-away view of the reach-back communications terminal, in accordance with the principles of the present invention. 
     In particular, as shown in FIG.  2 D( 1 ), the reach-back communications terminal further comprises a GSM personality card  800  that is accessible through GSM personality card access panel  810  on the bottom of the reach-back communications terminal. 
     The GSM personality card  800  allows the reach-back communications terminal to be uniquely identified by a GSM network, the same as a conventional GSM telephone contains a personality card  809  to uniquely identify it to a GSM network. 
     In the event that that the GSM personality card  800  needs to be accessed. The GSM personality card is extracted from the reach-back communications terminal  100  and replaced. GSM personality card access panel  810  is recessed on the bottom of the terminal to protect the GSM personality card  800 . 
     In the disclosed embodiment, the GSM personality card  800  is a subscriber identity module (SIM) card, or smart card, installed as part of a GSM cellular phone that encrypts voice and data transmissions and stores data about the specific user so that the user can be identified and authenticated to the relevant GSM network supplying the phone service. The GSM personality (SIM) card  800  also stores data such as personal phone settings specific to the user and phone numbers. A SIM can be moved from one phone to another and/or different SIMs can be inserted into any GSM phone. For example, if a user has one reach-back communications terminal at home, and another at the office, they can carry the GSM personality (SIM) card  800  with them between reach-back communications terminals. Alternatively, multiple GSM personality (SIM) cards  800  may be maintained by the user, and depending upon the context of the secure call (e.g., personal, business, specific contract or mission, etc.), they can swap between their various GSM personality (SIM) cards  800 . Of course, multiple users of the reach-back communications terminal can each carry their own GSM personality (SIM) card  800 , and install it into the reach-back communications terminal when they desire to use it. 
     In the disclosed embodiments, despite being a secure, reach-back communications terminal with encryption capability, the GSM personality (SIM) card  800  is preferably nevertheless mounted for easy external access by the user, as shown in FIG.  2 D( 1 ). As shown in FIG.  2 D( 1 ), a GSM SIM card reader  809  is preferably mounted near a surface of a case enclosing the reach-back communications terminal (e.g., near the bottom surface), with an access opening in the bottom surface allowing a user to easily swap between GSM personality (SIM) cards  800 . 
     FIG.  2 D( 2 ) shows a base cut-away view of the reach-back communications terminal, in accordance with the principles of the present invention. 
     In particular, as shown in FIG.  2 D( 2 ), the GSM personality card  800  is alternately viewed from the bottom of the reach-back communications terminal. 
     While the particular ports, personality cards and switches are shown in various locations and with various names, it will be understood by those of skill in the art that other locations on the reach-back communications terminal  100  may be suitable for any particular port and/or switch, while remaining within the scope of the present invention. 
     Although a GSM type personality card is discussed herein, it is preferable that any of various types of personality cards can be used with the reach-back communications terminal  100 . For example, various personality cards that might be used include, T-Mobile, Cingular. Moreover, the reach back communications terminal  100  may be adapted to accommodate a plurality of personality cards to allow for connection to a plurality of cellular networks. For example, OCONUS the user may want to use a personality card suitable for the geographic area, such as for an 1800 MHz network. 
       FIG. 3  shows an exemplary configuration for a reach-back communications terminal configured for access to a WAN, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 3 , the disclosed, exemplary reach-back communications terminal  100  further comprises accommodation for connection to a digital PBX via a digital PBX adapter  380 , a GSM fixed cellular terminal  382 , an Iridium modem via an Iridium modem adapter  384 , an analog to IP voice channel via an analog to IP voice adapter  386 , and a WiFi bridge  388 . 
     As discussed in relation to  FIG. 2A , by rotating the network selector switch  110  to one of a desired WAN, e.g., PSTN, PBX, GSM, SAT, IP and WIFI, respective components within the reach-back communication terminal are activated and internal signals are directed to communicate with the desired network. As the network selector switch  110  is rotated through positions PSTN, PBX, GSM, SAT, IP and WIFI, respective adapters digital PBX adapter  380 , GSM fixed cellular terminal  382 , Iridium modem adapter  384 , analog to IP voice adapter  386 , and a WiFi bridge  388  are activated allowing the reach-back communications terminal  100  to communicate with the chosen network. 
     Depending on the position of the network selector switch  110 , PBX telephone deskset  300 , personal computer  220  and a satellite handset  390 , e.g., an Iridium handset, are selectively configured by the reach-back communications terminal  100  for communicating with a respective network. 
     PSTN Communications 
       FIG. 4  shows the disclosed embodiment of a reach-back communications terminal  100  set up to establish voice communications through a PSTN network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 4 , a PSTN network is accessed directly from the front panel of the reach-back communications terminal  100  through a PSTN wall line jack  200 . The integrated telephone handset  176  is used to make unencrypted voice calls, similarly as with a conventional telephone. The integrated telephone handset keypad  175  is used to dial a target telephone number. 
     To establish an unencrypted voice call over a PSTN connection, network selector switch  110  is set to the PSTN position. The reach-back communications terminal  100  is connected to the PSTN wall line jack  200  by connecting a conventional PSTN cable  210  to PSTN port  125 . The integrated telephone handset keypad  175  is used to dial a destination telephone number. For unencrypted voice calls, the reach-back communications terminal  100  provides not further capability than a conventional PSTN telephone. 
     To establish an encrypted voice call over a PSTN connection, the network selector switch  110  is set to the PSTN position. The reach-back communications terminal  100  is connected to the PSTN wall line jack  200  by connecting a conventional PSTN cable  210 , e.g., an RJ-11 cable, to PSTN port  125 . The integrated telephone handset keypad  175  is used to dial a destination telephone number. 
     To designate a PSTN voice call as being encrypted, a user of the reach-back communications terminal  100  dials a prefix before dialing a destination telephone number. For example, for a secure encrypted telephone call, a user is required to dial “*02*” before dialing the destination telephone number 202-555-1212. Therefore, a user of the reach-back communications terminal  100  dials *02*-202-555-1212 to establish a secure encrypted PSTN voice call. If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure call with the remote end of the call. Alternately, after an unencrypted PSTN voice call is established, one of the calling parties must press “SECURE” on the personality faceplate keypad  146  to change the unencrypted PSTN voice call to an encrypted PSTN voice call. 
       FIG. 5  shows the reach-back communications terminal  100  set up to establish data communications through a PSTN network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 5 , to establish an unencrypted data call over a PSTN connection, the network selector switch  110  is set to the PSTN position. A serial cable or USB cable  230  is used to connect a personal computer  220  to the SDIPC  140  of the reach-back communications terminal  100 . The personal computer  220  must be set to recognize an external modem within the reach-back communications terminal  100 . The personal computer  220  is used to dial into a remote site. 
     To establish an encrypted data call over a PSTN connection, the network selector switch  110  is set to the PSTN position. A serial cable or USB cable  230  is used to connect a personal computer  220  to the SDIPC  140  of the reach-back communications terminal  100 . The personal computer  220  must be set to recognize an external modem within the reach-back communications terminal  100 . A data application on the personal computer  220  is used to dial into a remote site. 
     If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure PSTN data call between the personal computer  220  and a remote computer. Alternately, a user can toggle a “Secure Select” option on a configuration menu on the reach-back communications terminal  100 . Instructions are then given to the user of the reach-back communications terminal  100  for placing an encrypted PSTN data call. 
     PBX Communications 
       FIG. 6  shows the reach-back communications terminal  100  set up to establish voice communications through a PBX network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 6 , a PBX is accessed by the reach-back communications terminal  100  through a PBX telephone deskset  300  connected to a PBX wall plate  320 . A PBX handset cord  340 , e.g., an RJ-13, conventionally connected to a PBX handset  310  is disconnected and plugging into the PBX handset port  162  on the reach-back communications terminal  100 . A PBX deskset handset jack that is conventionally connected to the PBX handset  310  is instead connected to the PBX base port  174  using an appropriate cable, e.g., an RJ-13 telephone cord. The PBX telephone keypad  350  on the PBX telephone deskset  300  is used to perform dialing functions for calls using a PBX network. 
       FIG. 6A  depicts a digital PBX adapter connected with a PBX base unit, the handset of the PBX base unit, and a PSTN common bus/circuit switch connected in turn to an encryption unit, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 6A , the reach-back communications terminal  100  includes a digital PBX adapter  380  comprised largely of an audio switch  677 . The audio switch  677  has an adjustable output gain, controlled by the 4-position switch  165 . The adjustable gain is formed using, e.g., a well known resistor ladder circuit. While the adjustable gain control switch  165  in the exemplary embodiment has 4 positions, in graduated gain increments, more (or even fewer) gain selections within the audio switch  677  are also contemplated within the principles of the present invention. 
     The correct position of the adjustable gain switch  165  is empirically determined. The user will hear a reverb effect in the headset based on the volume capability of the PBX system. The FNBDT encryptor of the reach-back communications terminal  100  won&#39;t be able to establish modem communications with another FNBDT or STE encryptor if the PBX adjustable gain control switch is not properly set. 
     In the given embodiment, the gain control switch  165  is initially set in a common position (e.g., position 3). If the FNBDT encryptor is able to establish communications, then the setting is proper. If not, then the user manually switches the position of the gain control switch  165  to, e.g., position 2, and tries again to establish secure communications again. Again, if the communications are established, then position 2 is proper for the particular PBX being used. If not, then the user may manually move the gain control switch to, e.g., position 1 and try again. Position 4 may be tried after position 1. 
     The particular order of positions of the gain control switch  165  are for exemplary purposes only. 
     The LINE phone jack  174  of the digital PBX adapter  380  is wired to the vacated handset jack on the phone base unit using, e.g., a standard coiled handset cord. The handset that was disconnected from the base unit is then rewired into the HANDSET phone jack  162  of the digital PBX adapter  380  using, e.g., a standard coiled handset cord. 
     The output of the audio switch  677  is connected internal to the reach-back communications terminal  100  to a PSTN common bus of a switching circuit  678 , which in the PBX mode switches a 2-wire connection from the digital PBX adapter  380  to the PSTN IN input of the encryption device  145  (i.e., FNBDT encryptor). Other inputs to the PSTN common bus of the switch circuit  678  (e.g., GSM modem, etc.) are not shown in  FIG. 6A  for simplicity. 
     When the handset of the PBX is in an OFF hook condition, in an unsecure mode, then optical relays close to cause a bypass in the audio switch  677 . Thus, in the OFF hook condition, the PBX handset can be used to communicate with its handset base in an otherwise conventional fashion. Encrypted communications may take place through the FNBDT encryptor. 
     To make an unsecured PBX voice call, the reach-back communications terminal  100  does not provide any further capability beyond using the PBX telephone deskset  300 . The integrated telephone handset  176  is used to dial a destination telephone number and converse with a called party. 
     To make a secured PBX voice call, the network selector switch  110  is set to the PBX position. The PBX handset  310  is taken off-hook. The PBX telephone keypad  350  is used to dial a destination telephone number. Once a call is established with a destination telephone number, the integrated telephone handset  176  is used to converse with the called party 
     If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure PBX call with the remote end of the call. Alternately, after an unencrypted call is established, one of the calling parties must press “SECURE” on the personality faceplate keypad  146  to change an unencrypted PBX call to a secure encrypted mode. 
       FIG. 7  shows the reach-back communications terminal  100  set up to establish data communications through a PBX network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 7 , to make an unsecured PBX data call, the network selector switch  110  is set to the PBX position. A menu option on the personality faceplate  145  is chosen to allow unencrypted data communications. A PBX network is accessed by the personal computer  220  through the reach-back communications terminal  100  through the PBX telephone deskset  300  connected to a PBX wall plate  320 . The PBX handset cord  340  connected to a PBX handset  310  is disconnected and plugging into the PBX handset port  162  on the reach-back communications terminal  100 . A PBX deskset handset jack that is conventionally connected to the PBX handset  310  is instead connected to the PBX base port  174  using an appropriate cable, e.g., an RJ-13 telephone cord. Personal computer  220  is connected to the SDIPC  140  using a serial cable or USB cable  230 . 
     Both the integrated telephone handset  176  and the PBX handset  310  are left off-hook. The personal computer  220  must be set to recognize an external modem within the reach-back communications terminal  100 . The PBX telephone keypad  350  is used to dial a destination telephone number. After dialing the destination telephone number on the PBX telephone keypad  350 , a data application on the personal computer  220  is initiated to make a data link call. 
     To make an encrypted PBX data call, the network selector switch  110  is set to the PBX position. The PBX handset  310  is disconnected from the PBX telephone unit&#39;s handset jack and connected to the reach-back communications terminal&#39;s  100  PBX handset port  162 . The PBX telephone unit&#39;s  300  handset jack is connected to the reach-back communications terminal&#39;s  100  PBX base port  174  using an appropriate cable, e.g., an RJ-13 telephone cord. The personal computer  220  is connected to the SDIPC  140  using cable  230 . Both the integrated telephone handset  176  and the PBX telephone handset  310  are left off-hook. 
     The personal computer  220  must be set to recognize an external modem within the reach-back communications terminal  100 . The PBX telephone keypad  350  is used to dial a destination telephone number. After dialing the destination telephone number on the PBX keypad  350 , a data application on the personal computer  220  is initiated to make a data link call. 
     If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure PBX data call between the personal computer  220  and a remote computer. Alternately, a user can toggle a “Secure Select” option on a configuration menu on the reach-back communications terminal  100 . Instructions are then given to the user of the reach-back communications terminal  100  for placing an encrypted PBX data call. 
     GSM Communications 
       FIG. 8  shows the reach-back communications terminal  100  set up to establish voice communications through a GSM network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 8 , the GSM antenna  152  allows cellular communications to be established using any of four cellular frequencies. In particular, the GSM antenna  152  allows communications at frequencies of 850 MHz at 2.2 dBi, 900 MHz at 2.2 dBi, 1800 MHz at 3 dBi and 1900 MHz at 3 dBi over approved circuit-switched digital networks. 
     To initiate a secure call over a data network and not a GPRS network, a number designation proceeds the entry of a telephone number, e.g., “*02*”. To receive a secure message, the call initiator must use a designated number assigned to the reach-back communications terminal  100 . The reach-back communications terminal  100  conveniently has a separate non-secure GSM/GPRS data port  180  to allow users unencrypted access to a GPRS network if desired. 
     To establish an unencrypted voice call using a GSM network, the network selector switch  110  is set to the GSM position. The GSM antenna  152  is set up to optimize communications with a GSM network. The status indicator lights  120  will indicate that the reach-back communications terminal  100  is receiving a GSM signal. To allow a user of the reach-back communications terminal  100  to determine the strength of the signal, an LED indicator on the status indicator lights  120  will flash sequentially from one to four times to indicate the strength of the GSM signal. Alternately, a solid non-flashing LED indicator on the status indicator lights  120  will indicate a strong signal. 
     The integrated telephone handset  176  and the integrated telephone handset keypad  175  are used to dial and conduct conversations during an unencrypted voice call established over a GSM network. 
     To establish an encrypted GSM voice call, the network selector switch  110  is set to the GSM position. The GSM antenna  152  is set up to optimize communications with a GSM network. The status indicator lights  120  will indicate that the reach-back communications terminal  100  is receiving a GSM signal. To allow a user of the reach-back communications terminal  100  to determine the strength of the signal, an LED indicator on the status indicator lights  120  will flash sequentially from one to four times to indicate the strength of the GSM signal. Alternately, a solid non-flashing LED indicator on the status indicator lights  120  will indicate a strong signal. 
     The integrated telephone handset  176  and the integrated telephone handset keypad  175  are used to dial and conduct conversations during an encrypted telephone call established over a GSM network. To designate a telephone call as being encrypted, a user of the reach-back communications terminal  100  dials a prefix before dialing a destination telephone number. For example, for a secure encrypted telephone call, a user is required to dial “*02*” before dialing the destination telephone number 202-555-1212. Therefore a user of the reach-back communications terminal  100  dials *02*-202-555-1212 to establish a secure encrypted telephone call. If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure call with the remote end of the call. 
       FIG. 9  shows the reach-back communications terminal  100  set up to establish non-secure data communications through a GSM network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 9 , to establish an unencrypted GSM data call, the network selector switch  110  is set to the GSM position. The GSM antenna  152  is set up to optimize communications with a GSM network. The status indicator lights  120  will indicate that the reach-back communications terminal  100  is receiving a GSM signal. To allow a user of the reach-back communications terminal  100  to determine the strength of the signal, an LED indicator on the status indicator lights  120  will flash sequentially from one to four times to indicate the strength of the GSM signal. Alternately, a solid non-flashing LED indicator on the status indicator lights  120  will indicate a strong signal. 
     Personal computer  220  is connected to the SDIPC  140  by a serial cable or a USB cable  230 . A data application on the personal computer  220  dials into a remote site, with a remote site answering the call with a corresponding data application. 
       FIG. 10  shows the reach-back communications terminal  100  set up to establish secure data communications through a GSM network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 10 , to establish an encrypted GSM data call, the network selector  110  is set to the GSM position. A serial cable or USB cable  230  is used to connect the personal computer  220  to the SDIPC  140 . The GSM antenna  152  is set up to optimize communications with a GSM network. The status indicator lights  120  will indicate that the reach-back communications terminal  100  is receiving a GSM signal. To allow a user of the reach-back communications terminal  100  to determine the strength of the signal, an LED indicator on the status indicator lights  120  will flash sequentially from 1 to 4 times to indicate the strength of the GSM signal. Alternately, a solid non-flashing LED indicator on the status indicator lights  120  will indicate a strong signal. 
     A data application on the personal computer  220  is used to dial a remote site. The data application dials a prefix to designate a telephone call as being encrypted. For example, for a secure encrypted telephone call, the data application is required to dial “*02*” before dialing the destination telephone number 202-555-1212. Therefore the data application dials *02*-202-555-1212 to establish a secure encrypted telephone call. If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure call with the remote end of the call. Alternately, when an encrypted call is received, the receiving party must press “SECURE” on the personality faceplate keypad  146  to receive an encrypted GSM call. 
     IP Communications 
       FIG. 11  shows the reach-back communications terminal  100  set up to establish IP voice communications over an IP network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 11 , ethernet port  130  allows the reach-back communications terminal  100  to connect over any IP network, preferably supporting Dynamic Host Configuration Protocol (DHCP) addressing. Alternately, the reach-back communications terminal  100  can utilize a static IP address. To obtain a dynamically assigned IP address once connected to an IP network, the reach-back communications terminal  100  requests an IP address from the network. Alternately, a static IP address can be assigned to the reach-back communications terminal  100  for connection to an IP network. 
     To establish an IP unencrypted voice call using an IP connection, the network selector switch  110  is set to the IP position. Ethernet port  130  is connected to a conventional local area network (LAN) wall plate  600  using an appropriate cable, e.g., CAT 5, CAT 6, etc. The integrated telephone handset keypad  175  is used to dial a destination telephone number. 
     To establish an IP encrypted voice call using an IP connection, the network selector switch  110  is set to the IP position. Ethernet port  130  is connected to a LAN wall plate  600  using an appropriate cable, e.g., CAT 5, CAT 6, etc. The integrated telephone handset keypad  175  is used to dial a destination telephone number. 
     If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure call with the remote end of the call. 
       FIG. 12  shows the reach-back communications terminal  100  set up to establish IP data communications over an IP network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 12 , to establish an IP unencrypted data call using an IP connection, the network selector switch  110  is set to the IP position. The Ethernet port  130  is connected to a LAN wall plate  400  using an appropriate cable, e.g., CAT 5, CAT 6, etc. A serial cable or USB cable  230  is used to connect the personal computer  220  to the SDIPC  140  of the reach-back communications terminal  100 . The personal computer  220  must be set to recognize an external modem within the reach-back communications terminal  100 . 
     A menu option on the personality faceplate  145  is chosen to enable an unsecured data call. A data application on the personal computer  220  is used to dial a destination telephone number. 
     To establish an IP encrypted data call using an IP connection, the network selector switch  110  is set to the IP position. The Ethernet port  130  on the reach-back communications terminal  100  is connected to a LAN wall plate  400  using an appropriate cable. The integrated telephone handset&#39;s  176  integrated telephone handset keypad  175  is used to dial a destination telephone number. 
     If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure call with the remote end of the call. 
     WiFi Communications 
       FIG. 13  shows the reach-back communications terminal  100  set up to establish WiFi voice communications over a WiFi network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 13 , the WiFi antenna  154  connects to WiFi circuitry within reach-back communications terminal  100  that allows WiFi communications using a WiFi frequency, e.g. 2400 MHz at 3 dBi. A WiFi interface allows the reach-back communications terminal  100  to establish a secure connection over any IP network, preferably supporting DHCP addressing. Alternately, a static IP address can be assigned to the reach-back communications terminal  100  for connection to an IP network. 
     To obtain a dynamically assigned IP address once connected to a WiFi network, a WiFi bridge within the reach-back communications terminal  100  requests an IP address from a WiFi network. Secure communications are conducted over the WiFi network using Vonage voice-over-IP (VoIP) service for both voice and data. 
     To establish a WiFi unencrypted voice call using a WiFi connection, the network selector switch  110  is set to the WiFi position. The WiFi antenna  154  is set up to optimize communications with a WiFi network. The status indicator lights  120  will indicate that the reach-back communications terminal  100  is receiving a WiFi signal. The reach-back communications terminal  100  will automatically pick up an IP address from the WiFi network, possibly taking several minutes. Once a dial tone is available on the integrated telephone handset  176 , a destination telehphone number is dialed using the integrated telephone handset keypad  175  to established a call over a WiFi network. 
     To establish a WiFi encrypted voice call using a WiFi connection, the network selector switch  110  is set to the WiFi position. The WiFi antenna  154  is set up to optimize communications with a WiFi network. The status indicator lights  120  will indicate that the reach-back communications terminal  100  is receiving a WiFi signal. The reach-back communications terminal  100  will automatically pick up an IP address from the WiFi network, possibly taking several minutes. 
     The integrated telephone handset keypad  175  and the integrated telephone handset  176  are used to dial and conduct conversations during an encrypted voice call established over a WiFi network. 
     If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure call with the remote end of the call. 
       FIG. 14  shows the reach-back communications terminal  100  set up to establish WiFi data communications over a WiFi network, in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 14 , to establish a WiFi unencrypted data call using a WiFi connection, the network selector switch  110  is set to the WiFi position. A menu option on the personality faceplate  145  is chosen to allow unencrypted data communications. The WiFi antenna  154  is set up to optimize communications with a WiFi network. The status indicator lights  120  will indicate that the reach-back communications terminal  100  is receiving a WiFi signal. The reach-back communications terminal  100  will automatically pick up an IP address from the WiFi network, possibly taking several minutes. A serial cable or USB cable  230  is used to connect the personal computer  220  to the SDIPC port  140 . 
     To establish a WiFi encrypted data call using a WiFi connection, the network selector switch  110  is set to the WiFi position. The WiFi antenna  154  is set up to optimize communications with a WiFi network. The status indicator lights  120  will indicate that the reach-back communications terminal  100  is receiving a WiFi signal. The reach-back communications terminal  100  will automatically pick up an IP address from the WiFi network, possibly taking several minutes. A serial cable or USB cable  230  is used to connect the personal computer  220  to the SDIPC  140 . 
     If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure call with the remote end of the call. 
     SAT Communications 
       FIG. 15  shows the reach-back communications terminal  100  set up to establish satellite voice communications over a satellite network, in accordance with the principles of the present invention. 
     A satellite communications link allows a secure connection for both voice and data. The reach-back communications terminal  100  can interface with any satellite interface that accepts AT command input, e.g., Iridium, Inmarsat Mini-M, Globalstar, etc. The reach-back communications terminal  100  eliminates the need to dial into a red switch for Iridium, as is necessary with the GD Iridium Secure Module (ISM). Although a satellite telephone  390  is shown in  FIG. 3 , any data transceiver, e.g., a cellular telephone, is connectable to the SATCOM port  150  that is compatible with the particular connection used, e.g., a serial connection. 
     In particular, as shown in  FIG. 15 , to make an unsecured SAT voice call, the reach-back communications terminal  100  does not provide any further capability beyond using the satellite handset  390 . 
     To establish a secured satellite voice call using a satellite connection, the network selector switch  110  is set to the SAT position. Satellite transceiver  914  is connected to the SATCOM port  150  using an appropriate cable  915 , e.g., a serial cable. A keypad on the satellite transceiver is used to dial a destination telephone number. 
     Once a connection is established with a destination telephone number, the integrated telephone handset  176  is used to conduct conversations over the satellite network. If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure call with the remote end of the call. 
     To make an unsecured satellite data call, the network selector switch  110  is set to the SAT position. The satellite network is accessed by the personal computer  220  through the reach-back communications terminal  100  through the satellite telephone  390 . Personal computer  220  is connected to the SDIPC  140  using a serial cable or USB cable  230 . The personal computer  220  must be set to recognize an external modem within the reach-back communications terminal  100 . 
     A menu option on the personality faceplate  145  is chosen to enable an unsecured data call. The satellite telephone keypad  520  is used to dial a destination telephone number. After dialing the destination telephone number on a satellite transceiver keypad, the personal computer  220  is initiated to make a data link call. 
     To make an encrypted satellite data call, the network selector switch  110  is set to the SAT position. The personal computer  220  is connected to the SDIPC  140 . The personal computer  220  must be set to recognize an external modem within the reach-back communications terminal  100 . A satellite transceiver keypad is used to dial a destination telephone number. After dialing the destination telephone number on the satellite transceiver keypad, a data application on the personal computer  220  is initiated to make a data link call. 
     If the remote end of the call is configured for “Auto Secure on Answer”, the reach-back communications terminal  100  will automatically establish a secure satellite data call between the personal computer  220  and a remote computer. 
       FIG. 16  shows exemplary data rates for the different types of communication networks available with use on the disclosed reach-back communication terminal  100 , in accordance with the principles of the present invention. The maximum data rate on any given communication network is dependent on the type of encryption used, as shown. 
       FIG. 17  shows exemplary display buttons available on the personality faceplate keypad  146 , in accordance with the principles of the present invention. 
     In particular, as shown in  FIG. 17 , exemplary keys available to a user during use of the reach-back communications terminal  100  are, a Scroll key  510 , a PIN Menu key  520 , a Zeroize Menu key  530 , a Key Mgmt Menu key  540 , a Service Menu key  550 , a Config Menu key  560  and a Security Menu key  570 . 
     The Scroll key  510  allows a user to scroll through menu options viewable on the encryption device display  147 . 
     The PIN Menu key  520  allows a user of the reach-back communications terminal  100  to lock the terminal until a proper PIN has been entered on the personality faceplate keypad  146 . Moreover, the PIN Menu key  520  allows a user of the reach-back communications terminal to enter a menu to change the existing stored PIN. PIN menu is displayed only when an authorized user exists within the reach-back communications terminal  100 , and the reach-back communications terminal  100  is Off-Hook and not in a secure call. 
     The Zeroize Menu key  530  allows a user of the reach-back communications terminal to zeroize a keyset, i.e., zeroize all keys and zeroize APK. Moreover, the Zeroize key  530  allows deletion of an authorized user of the reach-back communications terminal  100 . Menus associated with the Zeroize Menu key  530  may be restricted to the Master User of the reach-back communications terminal  100 . 
     The Key Mgmt Menu key  540  allows a user of the reach-back communications terminal to enter a menu to view keys and generate an APK. 
     The Security Menu key  570  allows a user of the reach-back communications terminal to enter menus for adding a user, deleting a user, automatically locking the reach-back communication terminal  100 , clear data, automatically secure communications established with the reach-back communications terminal  100 , automatically answer data communications and automatically answer a ring to the reach-back communications terminal  100 . The options of deleting a user and automatically locking the reach-back communications terminal are only available to authorized users. 
     The Config Menu key  560  allows a user of the reach-back communications terminal  100  to view a key status, clear data, set FNBDT timeouts, set bypasses, set a data port rate and set a modem data rate. 
     The Service Menu key  550  allows a user of the reach-back communications terminal  100  to verify software versions and determine the serial number of the encryption device  145 . 
     While the invention has been described with reference to the exemplary embodiments thereof, those skilled in the art will be able to make various modifications to the described embodiments of the invention without departing from the true spirit and scope of the invention.