Abstract:
A method of handling incoming calls directed to a virtual communication subscriber is disclosed. An incoming call intended for the virtual communication subscriber is received at a first communication device. A call is placed to a second communication device using contact information provided by the virtual communication subscriber. Extension information is provided to a guest PBX when the call is answered which corresponds to a communication line associated with the second communication device. Upon connection to the second communication device, the incoming call is bridged with the call placed to the second communication device.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 10/889,325, entitled “Method for Handling Incoming Calls Directed to a Virtual Communication Service Subscriber via a Guest PBX,” filed Jul. 12, 2004, and issued Nov. 3, 2009 as U.S. Pat. No. 7,613,288, which is a continuation of U.S. application Ser. No. 09/826,714, entitled “Method for Handling Incoming Calls Directed to a Virtual Communication Service Subscriber via a Guest PBX,” filed Apr. 5, 2001, and issued Jul. 13, 2004 as U.S. Pat. No. 6,763,102. 
    
    
     TECHNICAL FIELD 
     The present invention relates to virtual communication systems (VCS), and more particularly, to a system for handling incoming calls directed to a virtual communication subscriber who is connected to a communication network via a Public Branch Exchange (PBX) where the PBX is not part of the VCS service. 
     BACKGROUND OF THE INVENTION 
     Virtual communication systems (VCS) have been developed which allow a person to work in non-traditional work environments, such as at home or in a hotel room while still affording the worker the benefit of sophisticated communication services. Systems such as the ones described in co-pending patent application Ser. Nos. 09/318,015 and 09/370,766, which are incorporated by reference, describe systems which allow for a remote worker to utilize sophisticated communication services provided by the network without requiring the worker to have special communication equipment. 
     One requirement of these virtual communications systems is that the remote worker identify a telephone number at which the worker can send and receive telephone calls. This can cause problems when the remote worker is located at a facility which uses a Public Branch Exchange (PBX) which is not associated with the VCS service (hereinafter referred to as “guest PBX). This is because guest PBX facilities typically have a general telephone number which accesses the guest PBX and extensions which are associated with each line that is connected to the guest PBX. To reach a particular party at a line associated with the guest PBX, an incoming caller must dial the general number and then be transferred to the particular party&#39;s line by either a person such as a receptionist or operator or through an automated system such as an Interactive Voice Response (IVR) system. Because a party using a guest PBX cannot be reached directly, a remote worker located at a guest PBX cannot effectively get access to all VCS services. 
     One solution to this problem is to equip the remote worker with a cellular telephone which can be used in conjunction with the VCS services to send and receive calls. However, this is not always an optimal solution, since cellular telephones have limited battery life and do not have secure connections. Therefore, a need exists for a technique for handling incoming calls directed to a virtual communication subscriber who is connected to a communication network via a guest Public Branch Exchange (PBX). 
     SUMMARY OF THE INVENTION 
     The present invention is directed to a method for handling incoming calls directed to a virtual communication subscriber who is connected to a communication network via a guest Public Branch Exchange (PBX). A remote worker logs onto a VCS platform and provides the VCS platform with his location information which includes a reach telephone number and extension information which is stored in a database server. The VCS platform provides the extension information to an IVR associated with the VCS platform. When a caller dials the remote worker&#39;s office telephone, the call is transferred to the VCS platform. The VCS platform retrieves the contact information for the remote worker and places a call to the current location of the remote worker which is received by the guest PBX. An IP message is also sent from the VCS platform to the IVR providing the IVR with the extension information. 
     When the call is answered, the IVR provides the extension information to the called party. Once the VCS platform has established a connection to the remote worker&#39;s line, the VCS platform will bridge the incoming call with the connection to the remote worker. While the call is being set up by the VCS platform, the VCS platform sends a message to the remote worker&#39;s PC indicating that an incoming call has been received. Included may be further information regarding the call. Once the call has been received by the remote worker&#39;s telephone, the remote worker can indicate acceptance of the call. 
     In another alternative embodiment of the present invention, the calling party may be using a multimedia communication device. In response to an incoming call, the VCS platform can send the calling party&#39;s device an instant message which contains the reach information and a short message indicating that when the operator answers the phone, please request the remote worker using the reach information. The VCS platform then forwards the call to the current location of the remote worker which is received by the remote PBX. When the call is answered, the calling party provides the reach information. At the same time, the VCS platform sends a message to the remote worker&#39;s PC indicating the presence of the call. The remote worker can then elect to answer the call or transfer the call to a voice mail server associated with the VCS platform. The calling party is then connected to the remote worker&#39;s line. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram of an exemplary virtual communication service (VCS) system of the present invention; 
         FIG. 2  illustrates a typical soft phone GUI that may be used by a remote worker implementing the VCS system of the present invention; and 
         FIG. 3  is a diagram of a network architecture which implements the method of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Referring to the figures in which like numerals indicate like elements,  FIG. 1  illustrates an exemplary architecture for a virtual communication system (VCS) in accordance with the present invention. A traditional office environment is shown as including a plurality of stations  10  coupled to a PBX  12  (host PBX) within an office complex. Each station  10  includes a telephone with conventional PBX features such as call forwarding, mute, hold, transfer, etc. As discussed above, an increasing number of workers may spend a portion of the workweek at locations other than the office. 
     These workers may be “telecommuters” (working at home or another fixed location) or traveling with no fixed location. In accordance with the present invention, these workers can now have a VCS station using a voice network and data network to connect the worker, via a remote VCS office platform, with the PBX in the office (or network, as the case may be). Throughout the remainder of this discussion, the term “remote worker” will be used and is considered to encompass the traditional “telecommuter” working at a home office, a “field employee” temporarily at a company location other than their usual office, “traveling” employees at a client site, hotel or any other facility. In general, an individual working from any location with at least voice telephone access and, preferably, modem access to a data network is considered to fall within the definition of a “remote worker” in accordance with the principles of the present invention. In addition, as will be described in detail hereinafter, the present invention will focus on those remote workers who are located at a facility which uses a PBX to which the remote worker does not have the immediate benefits of its functionality (e.g., client site, hotel, etc.). Hereinafter, a PBX which is operated by a third party and to which the remote worker does not have the benefit of its features, and, furthermore to which the remote worker may be accorded a significantly limited set of communication features will be referred to as a “guest” PBX. 
     A remote worker may obtain sophisticated communication services which may be achieved through a number of alternative connections between the remote workers VCS station and an office-based or host PBX. Referring specifically to  FIG. 1 , two different types of remote worker set-ups—(1) a cable modern-based remote worker  114 , where both voice and data are supplied over a single line; and (2) a two-line data and voice remote worker  116 , where a conventional modem is used to provide the data connection and a separate voice line, provided over a traditional PSTN for example, is used to handle the voice traffic. It is to be understood that the various components discussed above may or may not comprise physically separate components, but are viewed in these examples as “logically separate” components. Alternatively, a “one-line” arrangement, supporting IP telephony over a data network may be used to deploy the features of the VCS system. It is to be understood by those skilled in the art that any arrangement capable of providing both voice and data communication with the remote location are acceptable. 
     A remote VCS office platform  34  is in communication with both data network  32  and office PBX switch  12 . In particular, VCS office platform  34  is used to control the communication between office PBX  12  and remote worker  18  so as to provide the enhanced communication features at the remote worker&#39;s location. The VCS platform  34  includes switch controller  104 , web server  106  and database  108 . The VCS platform is preferably operated on a workstation, such as but not limited to a Sun Sparcstation. A voice connection  110 , such as a T1 line is shown as coupling voice network  28  to a communication switch  102 . The communication switch  102  may be part of the PSTN  28 , wireless network (not shown) or other type of data network (not shown). A data connection  112  is shown as coupling data network  32  to web server  106 . 
     The following discussion will provide details associated with call flow to/from a remote worker. A remote worker must first log in to the VCS system in order to avail himself of any of the call features discussed above. The remote worker initiates a VCS environment by logging in, via endpoint terminal  42  (such as a PC), over data network  32  to VCS office platform  34 . In particular, the endpoint terminal  42  connects to a security system  118  within web server  106 . Various security arrangements can be used to authenticate the remote worker and his capability to access the VCS system. For example a personal ID number and password may be used. Thus, only “authorized” individuals will access the IP VPN and the VPN will perform the necessary follow-up procedures to grant login permission to the remote worker. 
     Once the remote worker has been authenticated, web server  106  sends a message to switch controller  104 , indicating that the control of all telecommunications with the identified remote worker are to be passed by PBX  12  to VCS platform  34 . As a result, PBX  12  will now hand off all call control to VCS platform  34  for calls received for the remote worker&#39;s identified station  10  within the office (whether the calls originate within the office or outside of the office) and PBX  12  will react based upon instruction from VCS platform  34 . In particular, the “control message” prompts PBX  12  to “forward” all calls to/from remote worker&#39;s office extension directly to platform  34  for call control. Once remote worker  18  is authenticated, platform  34  transmits to remote endpoint terminal  42  (in this case, a PC) via data network  32  a “soft phone” interface so as to create a “virtual PBX” environment using the remote worker&#39;s home equipment (i.e., telephone and PC). Various call flows, both into and out of the home environment are now possible. 
     In general, VCS office platform  34  is used to emulate the PBX environment on the remote endpoint terminal and functions to communicate between PBX  12  and endpoint terminal  42  to control all communication. Using this arrangement, a remote worker is able to receive calls placed to them at their “office” number, regardless of the remote worker&#39;s current location. As such, a caller places a call to the remote worker in the usual fashion, dialing the office telephone number associated with the remote worker (for internal calls, abbreviated dialing in terms of a 4 or 5-digit number may be dialed; for external calls the traditional 7 or 10-digit number is dialed). PBX  12 , upon recognition of the dialed number, will “hand-off” the incoming call to VCS platform  34  via a CTI link  120  to switch controller  104 . The call is then passed to service controller  106  which performs a look-up in database  38  to determine the “reach” number for the remote worker (as controlled by the worker, the “reach” number may be a home phone number, an alternative work location number, a cell phone, or a hotel number for a traveling remote worker). Once the “reach” number is obtained, web server  106  sends an incoming call message to the remote worker&#39;s “soft phone” via data network  32 . 
     An exemplary soft phone is illustrated in  FIG. 2  which exemplifies some of the various PBX station-type functionalities available for the remote worker. The soft phone is preferably a JAVA applet which is generated by web server  106 . A graphical handset  52  is included and may be activated to go off-hook by a mouse click—either to answer an incoming call (forwarded from the office PBX) or place an outbound call (to be forwarded to the office PBX for completion). Display  50  may also include a set of line indicators, in this example, a pair of line indicators  54  and  56  (showing that two separate lines are coming into endpoint terminal  420 , where the indicators will illustrate the presence of an incoming call (by changing color, for example) or the hold state of one call while another is being answered (by blinking, for example). Associated with each line indicator  54 ,  56  may be a separate speed dial list, shown by elements  58  and  60 . Speed dial list  58 , for example may be a pull-down menu of a first set of often-called telephone numbers. Speed dial list  60 , which also may be a pull-down menu, may include fax numbers, beeper numbers, or any other telecommunication numbers the remote worker needs. Each speed dial list  58  and  60  has a separate connect button  62  and  64 , respectively. 
     Part of the graphical user interface included within display  50  is a message area  66 , which may advantageously provide more information than available at a station directly coupled to a conventional PBX. As shown, in the presence of an incoming call, message area  66  displays a message including caller ID information such as ANI and, perhaps, the name of the calling party. Display  50  may also include message waiting lights (as commonly found on station sets served by a PBX), such as message waiting indicators  68 ,  70  and  72  associated with voice mail, email, and fax messages. Further as found on PBX-based station sets, display  50  includes a set of buttons with various call treatments. Display  50  includes a transfer button  74 , conference button  76 , hold button  78 , mute button  80  and a forward button  82 . A set of display indicators  77 ,  79 ,  81  and  83  are associated with these call treatment functions (used to indicate whether or not the various types of call treatment have been activated). For example, if mute button  80  has been activated (such as by a mouse click), indicator light  81  will change in appearance as a reminder that the mute function (i.e., suppressing transmission on the return path) has been activated. 
     The soft phone allows the remote worker to have additional call flexibility beyond that associated with a traditional PBX (such as the speed dial pull-down menus described above). It is also possible to activate additional sets of call functionality via a call feature button indicated by more button  84 . Activation of the more button may bring up for the remote worker an additional set of call functionality (for example, initiating conference calls, accessing corporate messages, broadcasting messages to all station sets behind the office PBX, etc.). 
     As indicated above, once the remote worker logs into the VCS platform  34 , the remote worker is then able to receive incoming calls. However, in order for the remote worker to receive an incoming call, the remote worker must provide the VCS system with a telephone number at which the remote worker can be reached (i.e., reach number). This becomes a problem when the remote worker is working at a location associated with its own PBX (guest PBX) as illustrated in  FIG. 3 . The guest PBX system typically has a limited number of incoming lines (e.g., one incoming general telephone number) to which are associated a plurality of extensions. As such, to reach a particular line associated with the guest PBX, a caller must dial a general telephone number, and then have the call directed to the particular line by either a human operator or an Integrated Voice Response (IVR) system. Because the VCS system assumes that the number provided by the remote worker is a direct connection to that remote worker, the VCS platform does not have any way to notify the party (or IVR system) that answers the call any indication as to where to direct the call (e.g., an extension, name or room number). 
     Many offices and hotels utilize PBX systems thereby making this issue a real concern for remote workers. As will be described hereinafter, the present invention solves this problem and allows a remote worker to receive incoming calls even when the telephone station to which the remote worker is directing calls is connected to a guest PBX. It is to be understood by those skilled in the art that instead of a PBX, the system could be an Internet Protocol PBX (IPPBX), Centrex, or IPCentrex switch without departing from the scope and spirit of the present invention. 
     In accordance with the present invention, the remote worker logs onto the VCS platform  34  using his PC  304 . Once logged in, a soft phone downloads on the remote workers PC  306 . The remote worker uses the soft phone set up to provide the VCS platform  34  with his location information which includes a reach telephone number (e.g., the hotel main number) and extension information (e.g., his room number). In a preferred embodiment of the present invention, the soft phone would include a menu selection which is labeled either “Hotel Room Setup” or “Remote PBX Setup” which the remote worker would access to provide his contact information. The VCS platform  34  stores this information in a database server  108  ( FIG. 1 ). 
     In accordance with one embodiment of the present invention, the VCS platform  34  provides the extension information to an IVR  302  associated with the VCS platform  34 . When a caller dials the remote workers office telephone  10 , the call is transferred to the VCS platform  34  via the host PBX  12 . The VCS platform looks up in the VCS database server  108  the contact information for the remote worker. The VCS platform  34  then places a call to the hotel which is received by the guest PBX  312 . Simultaneously, an IP message is sent from the VCS platform  34  to the IVR  302  providing the IVR with the extension information. 
     When the call at the hotel is answered (either by a human operator or an IVR system (not shown)), the IVR  302  associated with the VCS platform  34  provides the room number to the hotel answering system (i.e., operator or IVR). The IVR  302  may use text-to-speech generation to provide the room number to the operator. Alternatively, the IVR can specifically request the remote worker by name (e.g., “Please connect me to John Smith&#39;s room”). In the case of an IVR system answering the call, the IVR  302  may provide DTMF signals which correspond to the room number (e.g., keypad tones which correspond to the numbers “2”, “3”, “4” to indicate room  234 ). Once the VCS platform  34  has established a connection to the remote workers line, the VCS platform will bridge the incoming call with the connection to the remote worker and the IVR  302  will be dropped from the call flow path. The IVR  302  may automatically be dropped from the call or the remote worker may affirmatively communicate to the VCS platform that the IVR  302  should be dropped from the call. 
     While the call is being set up by the VCS platform  34 , the VCS platform sends a message to the soft phone on the remote worker&#39;s PC  306  indicating that an incoming call has been received. Included may be further information regarding the call (e.g., ANI). Once the call has been received by the remote worker&#39;s telephone  308 , the remote worker can indicate acceptance of the call by clicking on a continue button (not shown) on the soft phone displayed on the worker&#39;s PC  306 . 
     In an alternative embodiment of the present invention, the calling party may be the entity to provide the remote PBX  312  with the extension information. When the calling party places a call to the remote worker&#39;s office telephone  10 , the call is transferred to the VCS platform  34 . At the same time, a message is sent from the office PBX  12  to the IVR  302  associated with the VCS platform  34  which prompts the IVR to play the extension number information to the called party. For example, the IVR may state: “John Smith is currently out of the office. I am transferring your call to John at his virtual office location. When the call is answered, please ask the operator (IVR) to transfer you to room  234  (John Smith).” 
     The VCS platform looks up in the VCS database server  108  the contact information for the remote worker. The VCS platform  34  then forwards the call to the hotel which is received by the remote PBX  312 . When the hotel operator or hotel IVR answers the call, the calling party either requests the remote worker&#39;s room number or asks for his room by name. At the same time, the VCS platform  34  sends a message to the remote worker&#39;s PC  306  indicating the presence of the call. The remote worker can then elect to answer the call by clicking on the appropriate selection on the soft phone or transfer the call to a voice mail server associated with the VCS platform  34 . The hotel operator then connects the calling party to the remote worker&#39;s line. If the remote worker elects to take the call, the remote worker can then pick up the receiver of the hotel telephone  308  and use the softphone on the worker&#39;s PC  306  to implement communication features to the call such as hold, mute, etc. If the remote worker elects to transfer the call to voice mail the call is re-directed to the voice mail server associated with the VCS platform  34 . 
     In another alternative embodiment of the present invention, the calling party may be using a multimedia communication device, such as, but not limited to an internet-capable cell phone, multimedia computer with VOIP software. In response to an incoming call, the VCS platform  34  can send the calling party&#39;s device an instant message which contains the reach information (i.e., room number) and a short message indicating that when the operator answers the phone, please request the remote worker using the reach information. For example, the instant message may read: “when your call is answered please request room  234 .” 
     The VCS platform looks up in the VCS database server  108  the contact information for the remote worker. The VCS platform  34  then forwards the call to the hotel which is received by the remote PBX  312 . When the hotel operator or hotel IVR answers the call, the calling party either requests the remote worker&#39;s room number or asks for his room by name. At the same time, the VCS platform  34  sends a message to the remote worker&#39;s PC  306  indicating the presence of the call. The remote worker can then elect to answer the call by clicking on the appropriate selection on the soft phone or transfer the call to a voice mail server associated with the VCS platform  34 . The hotel operator then connects the calling party to the remote worker&#39;s line. If the remote worker elects to take the call, the remote worker can then pick up the receiver of the hotel telephone  308  and use the softphone on the worker&#39;s PC  306  to implement communication features to the call such as hold, mute, etc. If the remote worker elects to transfer the call to voice mail the call is re-directed to the voice mail server associated with the VCS platform  34 . 
     While the present invention has been described in connection with the illustrated embodiments, it will be appreciated and understood that modifications may be made without departing from the true spirit and scope of the invention. For example, while the present invention is described with reference to incoming calls to a remote worker&#39;s hotel room, it can be appreciated that the present invention may be used in any situation in which a remote worker is working at a location associated with a PBX. It is to be understood that the particular embodiments shown and described by way of illustration are in no way intended to be considered limiting. Therefore, references to details of particular embodiments are not intended to limit the scope of the claims, which in themselves recite only those features regarded as essential to the invention.