Abstract:
A method and a system for managing communications sessions, in accordance to events that occur in either one of a telecommunications network, such as the PSTN network or a mobile telephone network, and a data communications network such as the Internet is provided. The system includes a service logic controller supporting a data structure that holds a plurality of communication session disposition program entries. The service logic controller connects with the telecommunications network and with the data communications network through respective gateways that transmit communication session disposition inquiry messages. In response to those messages, the service logic controller retrieves the appropriate communication session disposition program and generates from that program an instruction to the entity that originated the inquiry message. The communication session is then processed according to the instruction. In a most preferred embodiment, the system also includes a conditions and events controller, that supplies information to the service logic controller regarding events or conditions prevailing in the telecommunications network that may influence the communication session disposition program.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a system and method for handling communication sessions, such as telephone-related messages and electronic mail, among others that may originate from a telecommunications network or the Internet. 
     BACKGROUND OF THE INVENTION 
     A class of telephony services usually known as Single Number Service (SNS) or Personal Number Service (PNS) has been introduced in the marketplace in recent years to address mobility and call management needs of users. Their main characteristic is to provide call routing based on customer-programmed schedules. These services are usually implemented through proprietary service logic residing on either Service Control Points (SCP) in an Advanced Intelligent Network (AIN) or Intelligent Network (IN), or special purpose switch adjuncts or service nodes. 
     Since the introduction of these services, the telecommunications environment has significantly evolved (Internet/WWW, unified messaging) thereby increasing the events and conditions that could influence call completion decisions as well as the mechanisms available to reach the called party and the potential call delivery points. 
     Thus, there is a need in the industry to provide a more flexible communication session disposition mechanism that can take decisions regarding communication session disposition based on a broader range of events. 
     OBJECT AND STATEMENT OF THE INVENTION 
     An object of the invention is to provide a novel Service Logic Controller (SLC) responsive to events occurring in a telecommunications network or a data communications network to make decisions regarding the disposition of a certain communication session, such as a telephone call or electronic mail transaction. 
     Another object of the invention is to provide a system for the management of communication sessions, the system being capable to take communication session disposition decisions based on events occurring in a telecommunications network or a data communications network. 
     Another object of the invention is to provide an improved method for managing a communication session originating in either one of a telecommunications network and data communications network. 
     As embodied and broadly described herein, the invention provides a service logic controller for management of communication sessions originating in either one of a telecommunications network and a data communications network, the service logic controller including: 
     a first connection point permitting to exchange data with the telecommunications network; 
     a second connection point permitting to exchange data with the data communications network; 
     a data structure including a plurality of entries, each entry including an information element indicative of a certain call disposition program, said service logic controller being responsive to a communication session disposition inquiry message input through either one of the first and second connection points to associate a certain entry in the data structure with the communication session disposition inquiry message and output through either one of the first and second connection points a communication session disposition instruction message in accordance with the communication session disposition program of the certain entry. 
     Throughout this specification, the expression “communication session” is intended to encompass any session-oriented real-time or non-real time communication such as telephone-related messages, electronic mail messaging, video-conferencing, facsimile transactions and pager-related calls, SMS (Short Message Service), voice-mail, file-transfer etc. 
     Throughout this specification, the expression “telecommunications network” encompasses networks through which are exchanged primarily, but not exclusively, audio signals, such as the Public Switched Telephone Network (PSTN), mobile telephone networks and private telephone networks, among others. 
     Throughout this specification, the expression “data communications network” refers to networks that exchange primarily, but not exclusively, data such as electronic mail and file transfer, among others. Typical examples of data communications networks include networks based on the Transfer Control Protocol and Internet Protocol (TCP/IP), such as the Internet, Intranets and Extranets. 
     In a specific embodiment of this invention, the SLC connects with three independent network domains, namely the PSTN, a mobile telephone network and the Internet. The connection to the respective network domain is effected through gateways Each network is provided with a Detection Point Functional Element (DPFE) whose task is to detect a communication session that needs the services of the SLC. Once such communication session is detected, say a caller originates a telephone call from the PSTN, the DPFE issues a communication session disposition inquiry message through the associated gateway, directed at the SLC. When the instruction message is sent by the DPFE, the latter will typically suspend call processing pending the call disposition instructions from the SLC. 
     The SLC includes a data structure in the form of a database including a plurality of information elements, each information element being a user profile that contains a communication session disposition program. That program determines how a communication session is to be managed in dependence upon various factors, such as time of day, type of communication etc. In a very specific example, an illustrative script can be: “Between 9 to 5 on working days, route calls to my directory number (DN) from my customer list to my office unless my cellular phone is activated, in which case calls should be routed by the cellular phone. In all cases if my telephone is engaged through a dial-up connection with my Internet service provider, forward calls to the Voice-over-IP (VoIP) client. Route all fax calls to the Telco-provided fax store &amp; forward server and notify me on my pager.” 
     A Conditions and Events Controller (CEC) is coupled to the SLC to provide the latter with conditions and events information to enable the selection of the appropriate communication session disposition instruction based on the user&#39;s program. The CEC is linked to various condition agents (CA) residing in the three network domains that provide the CEC with status information on specific elements. Typically, such elements may be the status of the telephone line (busy or free) of the user in the PSTN, status of the cellular telephone of the user (activated or not activated) and the status of any dial-up connection session with an Internet service provider (session active or not active). Based on the information received from the respective CAs, the CEC builds a suitable message to pass the information to the SLC. The latter, in turn, utilizes this data to determine the proper communication session disposition in accordance with the user&#39;s profile. 
     The user&#39;s profile stored in the SLC may be altered to take into account updates or simply implement changes to suit the user&#39;s preferences. The modifications to the user&#39;s profile may be made through interactions with the data communications network. Most preferably, a server on the Internet supports a Service Logic Agent (SLA) that may interact with the user during a dial-up Internet connection session to store a user profile. Typically, the SLA provides a user-friendly way to build a suitable communication session disposition program. After the user profile has been built or altered, the SLA transfers the data to the SLC. The updating procedure can take the form of on demand data transfer, where the SLC initiates data exchange transactions with the SLA at periodic intervals, or the SLA may initiate an update of the SLC database when a change to the user profile is performed. 
     In a variant, dynamic user profile updates can also be effected during call processing. In this case, the SLC, after receiving a communication session disposition inquiry message, initiates a communication with the SLA to obtain profile-updating information. This procedure offers the advantage of effecting an update to the user profile in the SLC database only when an actual transaction involving that particular user is in progress. 
     The SLC may also receive data to alter the user profile from SLAs residing in the other network domains, such as the PSTN or the mobile telephone network. 
     Once the communication session disposition instruction is generated by the SLC, a message is assembled and transmitted to the DPFE that requested the instruction. The latter, upon receipt of the instruction manages the session accordingly. 
     As embodied and broadly described herein, the invention also provides a service logic controller for management of calls originating in a telecommunications network, the service logic controller including: 
     a first connection point permitting to exchange data with the telecommunications network; 
     a second connection point permitting to exchange data with the Internet; 
     a data structure including a plurality of entries, each entry including an information element indicative of a certain communication session disposition program; 
     said service controller being responsive to a communication session disposition inquiry message input through said first connection point to associate a certain entry in said data structure with the communication session disposition inquiry message and output through said first connection point an instructions message indicative of a communication session disposition instruction according to the communication session disposition program of said certain entry; and 
     said service logic controller being responsive to data received through said second connection point from the Internet to alter information elements and associated communication session disposition programs in said data structure. 
     As embodied and broadly described herein, the invention provides a system for management of communications sessions originating in either one of a telecommunications network and a data communications network, the system comprising: 
     a service logic controller including first and second connection points; 
     a first gateway for establishing an interface permitting to transfer data between the first connection point and a telecommunications network; 
     a second gateway for establishing an interface permitting to transfer data between the second connection point and a data communications network; 
     a data structure in the service logic controller including a plurality of entries, each entry including an information element indicative of a certain communication session disposition program, said service logic controller being responsive to a communication session disposition inquiry message input through either one of the first and second gateways to associate a certain entry in the data structure with the communication session disposition inquiry message and output through either one of the first and second gateways a communication session instructions message in accordance with the communication session disposition program of the certain entry. 
     As embodied and broadly described herein, the invention also provides a method for managing a communication session originating in either one of a telecommunications network and a data communications network, the method comprising the steps of: 
     providing a message indicative of an incoming communication session that originates in either one of the telecommunications network and data communications network; 
     suspending processing of the communication session; 
     accessing a data structure containing a plurality of entries, each entry including an information element indicative of a certain communication session disposition program; 
     selecting one of the entries in the data structure; 
     processing the communication session in accordance with the communication session disposition program of the selected entry. 
     As embodied and broadly described herein, the invention also provides a method for managing a telephone service to a called station coupled to the telecommunications network, the method comprising the steps of: 
     providing a message indicative of an incoming call to the called station; 
     searching a data structure in a service logic controller to determine a call disposition program associated with the called station; 
     processing the incoming call in accordance with the call disposition program associated with the calling station; 
     transferring data from a service agent residing in the Internet network to the Service Logic Controller; 
     processing the data transferred from the service agent in accordance with the call disposition program associated with the called station to generate a call disposition instruction. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is block diagram of a multi-domain communication system incorporating a communication session disposition mechanism in accordance with the invention; 
     FIG. 2 is a block diagram of an SLC constructed in accordance with the invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIG. 1 provides a block diagram of the various network components required by the mechanism under the present invention. The various network components and functions shown in this Figure illustrate primarily the logical relationship between these components and functions and as such may have no direct implications on the physical paths, either direct or indirect, and signaling supports used in the different implementations of this invention. 
     The network components are grouped in three distinct domains, namely the PSTN network domain  100 , the mobile network domain  102  and the Internet domain  104 . Generally speaking these domains issue and receive communications that can be telephone related messages or data. An SLC  106  connects with the respective domains through gateways  126 ,  110  and  112  respectively, to receive communication sessions disposition inquiry messages and to dispatch directions to the various network components as to how to manage the communication sessions. In addition, a CEC  114  is provided, that connects to respective CAs  134 ,  118  and  120  to obtain information on various conditions and events prevailing in the respective network domains. 
     The PSTN domain comprises an Originating Point Functional Element (OPFE)  122  that in essence originates a call to a certain subscriber. For example, the OPFE can be viewed as the central office to which connects the Customer Premises Equipment (CPE). The OPFE connects with a DPFE  124  that is responsible to identify call requests that require SLC  106  involvement. An illustrative embodiment of the DPFE  124  is an Advanced Intelligent Network (AIN) call model described by Bellcore [Bellcore GR-1298] [Berman et al, “Perspectives on the AIN Architecture”, IEEE Communications Magazine, pp. 27-32, February 1992]. The AIN call model is implemented on a switch (SSP) and permits to: 
     detect calls requiring SLC  106  involvement; 
     suspend call processing; and 
     send a message to an external device (the SLC  106  in this case) and wait for a response to complete the call. 
     The PSTN DPFE  124  in turn connects with a PSTN routing gateway  132 . The objective of the PSTN routing gateway  132  is route calls from the DPFE  124  up to the PSTN delivery point  128  or other routing gateways in the mobile network or the Internet. The routing gateways of the three domains are interconnected to one another as shown in the drawing, thus allowing inter-domain call transfer. For instance, a call originating in the PSTN routing gateway  132  be passed to the routing gateway of the mobile network or of the Internet network and then transported to a suitable delivery point. 
     The PSTN routing gateway  132  can be implemented as a routing table in the switch that directs the call to the right entity for completing the call based on the routing information generated by the service logic. The delivery point  128  can be any functional element capable of delivering a call to the user or to any termination point. That termination point can be: 
     home phone/line/DN 
     office/phone/line/DN 
     fax 
     modem 
     audio/video conference 
     any PSTN phone where the subscriber is registered 
     messaging service 
     Voice Messaging System (VMS) 
     unified/integrated messaging system 
     In addition to the above components that form part of a standard PSTN architecture, the PSTN network domain also incorporates a PSTN SLA  130  whose objective is to provide a platform to permit a user to alter or build a user profile. The PSTN SLA  130  can be implemented on any suitable hardware component of the PSTN that can support a database permitting a user through DTMF inputs or voice commands to alter elements of that database so as to build or modify a user profile containing a call disposition program or schedule. The SLA  130  can be implemented on a Service Control Point (SCP) in an AIN. A similar implementation in the mobile network could use the Wireless Intelligent Network (WIN) architecture developed by the Telecommunications Industry Association (TIA) standards Committee TR45.2. In the Internet  104  the SLA can be implemented as a software program written using a well-known language such as C++ or Java, running on a PC or an Internet server. 
     The PSTN also includes a CA  134  designed to detect events and conditions prevailing in the PSTN that can influence the call disposition decision taken by the SLC  106 . The CA  134  can be implemented in software on a switch and can be accessed from other elements in the network through standardized means such as the AIN. For example, AIN permits to invoke resource monitoring capabilities on the switch to know in which state is a line, i.e. idle, busy or out of service. More specifically, the CA  134  is designed to detect in a most preferred embodiment of the invention the following conditions and events: 
     A) Calling line identification: 
     calling domain number 
     calling name 
     B) Privacy indication 
     C) Subscriber&#39;s registered location 
     D) Caller line category: 
     emergency services (police department, hospital, fire station) 
     payphone 
     hotel/motel 
     government 
     mobile(cellular PCS) phone 
     E) Call type 
     voice 
     fax 
     modem 
     F) Local, long distance and/or toll status of incoming all 
     G) DTMF digits entered by caller, eg Personal Identification Number (PIN) 
     H) Called lines status 
     busy 
     no answer 
     idle 
     I) Monitored lines status 
     busy 
     no answer 
     idle 
     J) Caled line activity log/statistics: 
     on-hook to off-hook state transition 
     call attempts volume 
     answered calls 
     average call duration 
     K) Monitored line(s) activity log/statistics: 
     on-hook to off-hook state transition 
     call attempts volume 
     answered calls 
     average call duration 
     The SLC  106  can be implemented on any suitable server that connects to the gateways  126 ,  110  and  112 . The SLC  106  supports a database of user profiles enabling the logic to take a decision on call disposition. A block diagram of the SLC  106  is depicted at FIG.  2 . The SLC  106  comprises a database  200  holding a table associating different call disposition programs with respective user identifiers. Each disposition program can be viewed as a personal schedule that defines how a call will be managed in dependence of events reported by the CEC  114  (to be described later) and other conditions such as: 
     A) Date and time of incoming call 
     time of day 
     day of week 
     day of year 
     B) Business hours 
     holidays 
     employer&#39;s business days and hours 
     time zones 
     These conditions are provided by the system while the conditions that are reported by the CEC  114  are inherent to the status and events prevailing in the various network domains. 
     A search functional element  202  is designed to locate the particular call disposition program. This element will be discussed later. Suffice it to say that the call disposition inquiry message generated from any one of the domains carries a user identifier, permitting the SLC  106  to locate in the database  200  the appropriate entry. 
     A program logic functional element  204  is designed to process the selected user program in accordance with the events and conditions established in order to generate a call disposition instruction that is then issued to the network domain that made the original call disposition inquiry. 
     As mentioned earlier, the SLC  106  can be implemented on a server including a memory for storage of program elements implementing the functional blocks of the search function  202  and the program logic  204 , and a processor to execute those program elements. A mass storage unit should also be provided to hold the database  200 . 
     The CEC  114  can also be implemented on a suitable server that communicates with the respective conditions agents in the network domains. The main objective of the CEC  114  is to obtain information on the various conditions and events prevailing in the respective network domains and to communicate this data to the SLC  106 . One possible way to implement the functionality of the CEC  114  is to provide a system that functions on demand, in other words, generating the desired information following a request message from the SLC  106 . More specifically, when the SLC  106  is invoked to determine the disposition of a call, the program logic  204  determines the events and conditions on which information is requested in order to make the suitable decision. The SLC constructs a suitable inquiry message that is addressed to the CEC  114 . Upon reception of this inquiry message, the CEC  114  decodes the message and determines the conditions and events on which a report to the SLC  106  must be made. Next, the CEC  114  determines which ones of the condition agents must be interrogated in order to generate the desired response. Suitable inquiry messages are then dispatched to the respective conditions agents that, in turn, respond accordingly. The various responses are then assembled to form a suitable response message and that message is then passed to the SLC  106 . 
     The relationship between the SLC  106  and the CEC  114  on one hand and the mobile network  102  on the other hand is similar to the case involving the PSTN  100 . More specifically, the mobile network includes an originating point functional element, a detection point functional element, a gateway service agent, a conditions agent, a routing gateway and a delivery point, that are similar to those described in connection with the PSTN  100 . The delivery point functional element may be implemented in the mobile network domain by the following: 
     phone set 
     fax 
     modem 
     messaging service 
     voice messaging system (VMS) 
     unified/integrated messaging system 
     short message service (SMS) 
     The following is a non-exhaustive list of the events and conditions that the conditions agent in the mobile network domain may detect and report: 
     A) Monitored line status 
     busy 
     no answer 
     idle 
     B) Called line activity log: 
     on-hook to off-hook state transition 
     call attempts volume 
     answered calls 
     average call duration 
     C) Monitored line(s) activity log: 
     on-hook to off-hook state transition 
     call attempts volume 
     answered calls 
     average call duration 
     D) Mobile phone (Cellular and PCS) status 
     on/off status 
     roaming status 
     roaming location 
     mobile set location 
     As to the data communications network  104 , such as the Internet, similar functional elements are also provided. In most instances, the functional elements are in the form of software implemented on various nodes of the network  104 . In the case of calls originating from the internet, a call can be made from a VoIP client such as Microsoft NetMeeting (software commercialized by Microsoft, USA). When an alias (the called party telephone number or e-mail address are examples of an alias) is passed as the called party address, the VoIP client suspends call processing and sends a message to the SLC  106 , through the gateway  112 , in order to get the final address. The SLC checks if the supplied alias corresponds to a subscriber. If the alias can be matched to a known subscriber, the called party SLA is invoked to provide the routing information. If the called party cannot be matched to a subscriber, the SLC can ask the CEC  114  to figure out if the person is connected to the Internet. The CEC  114  would contact the CA  120  in the Internet domain that could be a server containing a list of people connected to the Internet with their current addresses; this type of service is offered by the Microsoft Internet Locator Server (ILS). If the called party is not connected to the Internet, the SLC  106  could contact the SLA in the Internet domain in order to get the IP address of a VoIP gateway closest to the called party area along with the telephone number to complete the call. 
     The delivery point functional element may be implemented in the Internet network domain by the following: 
     Voice-over-IP (VoIP)client 
     Internet telephone 
     Internet audio/video conference 
     E-mail 
     Chat server 
     The following is a non-exhaustive list of the events and conditions that the conditions agent in the Internet domain may detect and report: 
     A) Internet telephony activity 
     Registration status to Internet telephony/data server 
     H. 323   
     call attempts 
     answered calls 
     average call duration 
     VoIP call origination 
     B) Dial-up Internet connection status 
     active 
     not active 
     The SLA  135  is used as the main tool to allow the user to develop and configure a user profile. The SLA  135  is a software element residing in a well-known location on the Internet, in other words, having a known URL. When the user wishes to build or update his/her profile he/she accesses the URL, say through an HTTP transaction. The software may be designed to present the user with a series of dialog boxes permitting to facilitate the data entry process. In essence, the user is required to supply the information necessary to generate the call disposition program. Once this information is entered, a database for the user is built on the server supporting the software element. That database is then uploaded to the SLC  106  so the entry in the main database  200  for that particular user can be generated. Several possibilities exist to complete this procedure. A first possibility is to configure the SLC  106  to periodically upload the data from the SLA  135 . In a specific example, the SLC  106  initiates at predetermined periods (say every day), a communication with the SLA  135  to upload the data it holds. Another possibility is assigning to the SLA  135  the responsibility to update the main database  200  at the SLC  106 . For instance when the SLA  135  detects a change to the data it holds, then it automatically initiates a data uploading transaction with the SLC  106 . 
     In a possible variant, the computer of the user that establishes a dial-up connection with the SLA  135  may be designed to provide an updating function that is transparent to the user. For instance, the software on the computer may be designed to detect certain data changes in a personal information manager or an agenda to determine that a user profile update is to be effected. When such event is observed, the local software initiates a communication with the LA  135  at the URL location, when a dial-up Internet session is established by the user. This allows to keep the user profile as current as possible with only limited user intervention. 
     The purpose of the following information flow is to illustrate the overall system behavior but it is not intended to limit the scope of the invention to this specific flow. 
     1. The user starts a dial-up Internet session 
     2. The SLA  135  is programmed to report any changes made to the user profile database to the SLC  106 . Assume for the purpose of the example that the user makes a modification to his call management schedule/program. 
     3. The SLA  135  reports the changes to the SLC  106 . 
     4. The CA  120  in the Internet domain reports to the CEC  114  that the user is in an active dial-up Internet session. Here the CA  120  may be the server of the Internet service provider that can detect the active session and report this condition to the CEC  114 . 
     5. A call to the user&#39;s DN from a PSTN OP, say a pay phone is initiated. 
     6. The call reaches the DPFE  124  and it is identified as necessitating SLC  106  processing. The DPFE  124  suspends call processing, sends an instruction request to the SLC  106  through the gateway  126 , and waits for instructions. An example of a DPFE is an AIN trigger. 
     7. The gateway  126  relays the DPFE  124  request to the SLC  106  in the appropriate format. That request includes the information necessary to identify the user. That information may be the telephone number dialed at the payphone. 
     8. The SLC  106  activates the user&#39;s call disposition program. As mentioned above, the message forwarded to the SLC  106  by the gateway  126  carries sufficient information to identify the user. Based on the data the search functional element  202  retrieves from the database the user&#39;s call disposition program and passes it to the program logic functional element  204 . The call disposition program requires in the example that the SLC  106  communicates with various SLAs and obtains information from the CEC  114 . For simplicity, assume in this case that the SLC  106  must communicate with one PSTN SLA. 
     9. The SLC  106  communicates with the PSTN SLA  130  (say the Personal Number Service (PNS)) to obtain the latest PNS update. 
     10. The combined SLC  106  and PNS SLA indicate that for calls from authorized callers list, payphones and emergency services and if within an active dial-up Internet session, route to Internet VoIP. 
     11. Caller&#39;s DN is not in authorized callers list. SLC  106  requests CEC  114  to verify nature of calling number and status of dial-up Internet session. 
     12. CEC  114  requests PSTN CA (such as a Line Information Database (LIDB)  134  to report on nature of the calling number. The LIDB  134  CA answers with payphone type. 
     13. CEC  114  answers to SLC  106  with a calling number of payphone type and dial-up Internet session status active and provides user&#39;s current IP address. 
     14. SLC  106  instructs PSTN DPFE  124  to route call to user&#39;s VoIP Internet Routing Gateway. 
     15. PSTN DPFE  124  routes call to PSTN routing gateway  132  that connects the call to the VoIP Internet routing gateway. 
     16. The VoIP Internet routing gateway translates the incoming call to IP format and connects it to the VoIP client of user. 
     An additional example will help illustrate the operation of the system in accordance with the present invention: 
     1. The user establishes a dial-up Internet session; 
     2. The user places a call over the data communication network using VoIP; 
     3. The call reaches the DPFE  140  and is identified as necessitating SLC  106  processing. The DPFE  140  suspends call processing, sends a query to the SLC  106  through the gateway  112  and waits for instruction. In this example the DPFE  140  is preferably software implemented on any suitable node on the Internet that is in the pathway between the originating point and the destination point of the VoIP call. The DPFE  140  recognizes the call as one requiring SLC  106  processing based on the data contained in the IP packets it receives. This information may be an alias rather than a final destination address or a flag indicating that routing processing is required. The gateway  112  relays the DPFE  140  request to the SLC  106  in the form of a call disposition inquiry message. This message includes any suitable information to enable the SLC  106  to identify the called party. In this particular case, the information may be an e-mail address. The SLC  106  activates the called party call disposition program. As mentioned above, the message forwarded to the SLC  106  by the gateway  112  carries sufficient information to identify the called party. Based on the data, the search functional element  202  retrieves from the database the called party&#39;s call disposition program and passes it to the program logic functional element  204 . The call disposition program requires in the example that the SLC  106  communicates with various SLAs and obtains information from the CEC  114 . For simplicity, assume in this case that the called party is connected to the Internet and that the SLC  106  routing logic indicates to route all the Internet originated calls through VoIP when this condition holds; 
     4. The SLC  106  requests CEC  114  to verify if the called party is currently connected to the Internet; 
     5. The CEC  114  queries the Internet CA  120  on the availability of the called party on the Internet. Here, the CA  120  can be implemented by software in the form of a database on a server that can determine on the basis of the query message issued by the CEC  114 , the desired information. For instance, the database may contain a list of destination points (identified on the basis of e-mail address for example) and corresponding IP addresses. Thus, the CEC  114  passes in the inquiry message the e-mail address of the called party and the CA  120  queries the database to determine if call completion can be effected in the Internet domain, and in the affirmative to get the IP address of the called party. A suitable response is assembled and sent back to the CEC  114 . Alternatively, the IP address may be stored in the SLC  106 , that will then avoid the necessity of establishing a dialogue with the CA  120 . 
     6. The CEC  114  returns the IP address to the SLC  106 ; 
     7. The SLC  106  instructs the DPFE  140  to route the call to the IP address of the called party; 
     8. The DPFE  140  routes the call to the IP address of the called party; 
     9. The called party receives the call that can then be answered or otherwise disposed. 
     The above description of a preferred embodiment under the present invention should not be read in a limitative manner as refinements and variations are possible without departing from the spirit of the invention. The scope of the invention is defined in the appended claims and their equivalents.