WO2011095652A1 - Système et procédé d'acheminement d'appels dans un réseau ims - Google Patents

Système et procédé d'acheminement d'appels dans un réseau ims Download PDF

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Publication number
WO2011095652A1
WO2011095652A1 PCT/ES2010/070066 ES2010070066W WO2011095652A1 WO 2011095652 A1 WO2011095652 A1 WO 2011095652A1 ES 2010070066 W ES2010070066 W ES 2010070066W WO 2011095652 A1 WO2011095652 A1 WO 2011095652A1
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WO
WIPO (PCT)
Prior art keywords
uri
request
sip
enum
module
Prior art date
Application number
PCT/ES2010/070066
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English (en)
Spanish (es)
Inventor
David FLÓREZ RODRÍGUEZ
José Luis PEÑA SEDANO
Manuel NÚÑEZ SANZ
Original Assignee
Telefonica, S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonica, S.A. filed Critical Telefonica, S.A.
Priority to PCT/ES2010/070066 priority Critical patent/WO2011095652A1/fr
Priority to ARP110100340A priority patent/AR080104A1/es
Publication of WO2011095652A1 publication Critical patent/WO2011095652A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1076—Screening of IP real time communications, e.g. spam over Internet telephony [SPIT]

Definitions

  • the invention relates, as expressed in the statement of this specification, to a system and method of routing calls in a Multimedia Internet Subsystem (IMS) network which is intended to allow the routing of calls in accordance with preferences of the user and / or the network operator, so that calls can be made according to the needs of the user and / or the network operator.
  • IMS Multimedia Internet Subsystem
  • UA user agent
  • SIP Session Identification Protocol
  • the call generated in a UA is received in a first module Intermediate Call Session Control Function (P-CSCF) that is assigned to the UA that generated the call.
  • P-CSCF Intermediate Call Session Control Function
  • the call is made through a request (INVITE), which contains a User Resource Identification (URI) parameter that contains a Resource Identifier of User who identifies a Telephone number (TEL URI), so that the request is sent to a first module Intermediate Call Session Control Function (P-CSCF) to which the UA making the call is assigned, which it is done by means of a request (INVITE) that contains a TEL URI.
  • URI User Resource Identification
  • TEL URI Telephone number
  • the first P-CSCF module sends the request to a first Service Call Session Control Function (S-CSCF) module that is assigned to said first P-CSCF module.
  • S-CSCF Service Call Session Control Function
  • the first S-CSCF module translates the TEL URI into a SIP URI (Universal Resource Identification Session Initiation Protocol) in order to route the INVITE request to the requested destination terminal.
  • SIP URI Universal Resource Identification Session Initiation Protocol
  • This translation is done through an ENUM request (E.164 Number Mapping) to a DNS server (Domain Name Server), which returns a list of URIs, which probably contains the SIP URI of the called terminal.
  • a typical TEL URI has a format, such as tel: + 34-91-337-4005, which consists of a prefix "tel” followed by the telephone number.
  • the first S-CSCF module After receiving the INVITE request, the first S-CSCF module translates it to an E.164 number which according to the example would be 50047331943. 64. harp, which comprises the telephone number in reverse order, followed by a suffix "el64.arpa".
  • the ENUM request is made using an NAPTR command from the DNS protocol to the DNS, so that the composite number E.164 is included in the NAPTR command so that the DNS returns the list of mapped URIs corresponding to the original TEL URI included in the request INVITE
  • the first S-CSCF module locates the URI, which can be a SIP-URI (Internet Protocol User Resource Identifier), a telephone number or an H.323 command which is the protocol used to perform voice over IP (Internet Protocol) and IP videoconferencing services.
  • the first S-CSCF module routes the call to a UA connected via the Internet, a UA of a mobile network, a UA corresponding to a telephone terminal or a UA with H.323 capacity, such as It is described in the embodiment of the invention.
  • the ENUM mechanism is used to directly translate a TEL URI to a SIP-URI, another TEL URI or an H.323 URI, so that the first S-CSCF module searches for the URIs received in the content of the NAPTR response.
  • the order field and the preference field of the NAPTR response can be used to find out the order in which the recovered ENUM URIs are processed and how they are classified when multiple URIs are retrieved in the response.
  • ENUM offers a basic mechanism for choosing different translation options, it lacks the capabilities to establish a more complex mechanism based on:
  • Terminal Capabilities Nor can the incoming call be directed based on the capabilities of the user's terminal that has better conditions to meet the incoming call.
  • the invention has developed a new system and method of routing calls in the IMS network, which, like the conventional call routing system of the IMS network, a call is made in a UA connected via internet or a UA of a mobile network, with the condition that they are equipped with SIP capabilities.
  • the call is generated by a request that contains a TEL URI, so that the request is received in a first P-CSCF module to which the UA making the call is assigned, to receive the request, provide answers and send the request to a first S-CSCF, to which it is assigned to said first P-CSCF, which, from a set of URIs, obtains the URI corresponding to the called terminal.
  • the request is then sent to a second S-CSCF module assigned to the obtained URI corresponding to the called number, which sends the request to a user terminal selected from: A UA connected via the Internet and a UA of a mobile network, in which case the second S-CSCF module sends the request to the UA through a second P-CSCF module assigned to said second S-CSCF module.
  • the second S-CSCF module sends the request to the Public Switched Telephone Network (PSTN), by means of an element Control Function of the Delivery Gateway (BGCF) that uses a gateway for signaling (SGW) to translate SIP commands to a PSTN signaling, and reach the telephone terminal, maintaining the audio flow between the telephone terminal and the calling UA through a media gateway element (MGW) ).
  • PSTN Public Switched Telephone Network
  • BGCF Delivery Gateway
  • SGW gateway for signaling
  • MGW media gateway element
  • the second S-CSCF module sends the request to an Interconnection Limit Control Function (IBCF) element that by an element of IBCF
  • Interworking function that translates SIP commands into H.323 commands.
  • the main novelty of the invention is that it is characterized in that the first S-CSCF module is connected to an application server (AS), to which it sends the request and which in turn includes:
  • AS application server
  • E.164 number mapping mapping application protocol server element (ENUM SIP AS), by means of which the connection to the first S-CSCF module is made to receive the request and convert the TEL URI into a number E.164.
  • E.164 Number Mapping Names Domain Server (ENUM DNS) that is connected to the ENUM SIP AS, and that stores the set of URIs assigned to each TEL URI.
  • ENUM DNS Number Mapping Names Domain Server
  • a first information storage database complementary to that provided by the ENUM DNS, which stores data referring to blacklists, or schedules that define which user can be called and in what period of time. At this point it should be noted that the first database is also connected to the ENUM SIP AS.
  • the ENUM SIP AS is equipped with means to initially interrogate the ENUM DNS which, depending on the response obtained, interrogates the first database and obtains a URI to route the request to the second S-CSCF module through the first S module -CSCF corresponding to the URI of the established destination terminal.
  • the invention has the great advantage that the URI can be determined on the basis of user-defined blacklists, which allows the incoming call to be treated appropriately according to the caller's identification, so that if the caller is included in said blacklists, the call will be rejected.
  • the invention also allows defining white lists established by users who can make a call to the end user's terminal.
  • the invention also allows the creation of programming and schedules, so that the call is redirected to different destinations according to the time of day and / or the day of the week it is received.
  • the first database is provided with a Structured Database Access Language (SQL) interface, which facilitates the operation of the system of the invention.
  • SQL Structured Database Access Language
  • the system of the invention provides for the incorporation of a second database of the network operator in the AS, to allow the storage of complementary information to that provided by the ENUM DNS and by the first database, so that said second database stores information regarding blacklists, whitelists or schedules that define which user can be called and in what periods of time, depending on the needs of the network operator .
  • This configuration therefore allows the network operator to establish his own set of preferences to perform the same functions as the user according to his needs and commercial and / or technical policies.
  • This configuration also allows the modification of the data stored in the first and second database, by the user and by the operator, which gives the system a great versatility that allows the network to be adapted to the needs of the operator and the network users themselves.
  • the AS ENUM SIP of the AS is connected to a storage presence server of the connection state of the called terminal, to detect the status and connection of said called terminal, which allows to choose which of the user terminals must be route the request, depending on its connection status, since, as previously mentioned, the user can have several terminals in the IMS network.
  • the AS ENUM SIP of the AS can be connected to an email server, since it may be the case that the selected URI identifies an email address, in which case the ENUM SIP AS sends an email to said email server.
  • the ENUM SIP AS is equipped with means to send to the UA that issued the request, through the first S-CSCF and the first P-CSCF, an answer indicating that an email has been sent and that The request could not be answered, all after having previously received a response from the email server indicating receipt of the email sent by the ENUM SIP AS.
  • SIP AS of ENUM detects that a conference cannot be established with the destination URI and that is why it sends an error indication back to the originating terminal, also indicating that an email has been sent.
  • the ENUM SIP AS selects a URI that identifies an email address, so that the ENUM SIP AS is provided with means to receive a text message and send it to the identified email server, which after receiving an indicative response of receiving the mail, sends a response to the UA that issued a message in your request, indicating that the request has been processed correctly.
  • MESSAGE written text message
  • a request may include Session Description Protocol (SDP) information, indicative of the capabilities with which the UA making the call wishes to establish a session with the called UA, for which either in the first or second AS database, data corresponding to the capabilities of the UAs, s associated with each URI that identifies them, or data corresponding to the capacities prohibited to each URI that identifies them or both types are stored of data, so that the ENUM SIP AS is equipped with means to establish a priority of one URI over others or establish a priority that discards a URI over others, depending on the data that has been stored.
  • SDP Session Description Protocol
  • the call can be directed to one of the user's terminals depending on their capabilities. It is possible that the selected URI identifies a website, in which case the EN EN SIP AS of the AS is equipped with means to issue a message to the UA that generated the call indicating that the resource is not available, also including in said message A new URI with which the UA that generated the call should contact. The message is sent to the UA that generated the call through the first S-CSCF and the first P-CSCF.
  • the ENUM SIP AS can also be enabled to assume some other functions of great interest to users and network providers, simply by storing the relevant information in the ENUM DNS or in the first and second databases, and configuring the ENUM SIP AS so that it applies the appropriate resolution algorithms on the recovered data elements, for example they can be:
  • Enable complete secure transactions (electronic banking, electronic commerce) by verifying user identification, authorization and authentication tasks performed by the IMS system.
  • the invention relates to a method that works according to the system described, for which it comprises:
  • a list of URIs s that identify SIP URI addresses assigned to the TEL URI, from which the request is sent to the second S-CSCF module that makes the signaling to the called user terminal and sends the request to a second P-CSCF module assigned to said second S-CSCF, to connect to the called user terminal, in which in this case the user terminal is constituted by a UA connected via internet or a UA of a mobile network, in both cases they have of being equipped with SIP capabilities.
  • the second S-CSCF module sends the call to the PSTN network, through a BGCF that uses an SGW gateway to translate the SIP commands to a PSTN signaling and reach the telephone terminal, maintaining the flow of audio between the standardized telephone and the IMS terminal using an MGW.
  • the second S-CSCF module sends the call to an IBCF that, through an IWF element, translates the IP commands to H.323 commands;
  • the first database is also included in the AS, so that the ENUM SIP AS obtains a URI based on the information obtained from the first database and the ENUM DNS.
  • the method includes questioning the SIP
  • ENUM AS to a second information storage database referring to the network operator and complementary to that provided by the ENUM DNS and to the first database.
  • the information stored in said second database is determined by blacklists, white lists or schedules that define which user can be called and in what periods of time, so that after the interrogation by the ENUM SIP AS to the second base of data, a URI is obtained based on the information provided by the second database, so that access to the user terminals can be established according to the needs required by the network operator, as already mentioned.
  • the method of the invention comprises sending from the AS EN SIP AS of the AS to a storage presence server, a question regarding the connection status of the called terminal, so that it detects the connection status of each of the terminals of the user and choose which of them is in operational state to send the request.
  • the obtained URI identifies an email address, in which case when the ENUM SIP AS detects a URI that identifies an email, it sends an email to an email server where it receives a reply from reception of the mail and issues a response, indicating that it has not been possible to respond to said request, to the UA that issued the request through the first S-CSCF and the first P-CSCF.
  • the ENUM SIP AS selects a URI that identifies an email address.
  • the ENUM SIP AS sends the received text message to an email server, from which after receiving a response from receiving the mail, it emits an answer indicating that the request has been processed correctly to the UA that issued the request .
  • This response from the ENUM SIP AS to the UA is sent through the first S-CSCF and the first P-CSCF.
  • the requests also include SDP information indicative of the capabilities with which the UA making the call wishes to establish a session with the called terminal, in which case the method comprises a detection phase by the ENUM SIP AS of the capabilities AS of the UA associated to each URI that identifies them or a phase of detection of the prohibited capacities to each URI that identifies them, so that it selects a URI based on the capacities or the established prohibitions.
  • the URI obtained identifies an address of a website, in which case the SIP AS of ENUM of the AS issues a message to the UA that generated the request, indicating that the resource is not available, and in that message also includes a new URI, with which the UA that generated the call must contact.
  • Figure 1. Shows a functional block diagram of the basic operation of a conventional IMS network that is described in greater detail to facilitate a better understanding of the novel features of the invention.
  • Figure 2. Shows a diagram of the different phases of the call method established in the conventional IMS network.
  • Figure 3. Shows a functional block diagram of a possible embodiment of the system of the invention.
  • Figure 4.- Shows a representative diagram of the operation of the method of the invention.
  • the call originates from a UA 1 connected via the Internet 3 or a UA 2 from a mobile network, both equipped with SIP capabilities.
  • Each of the UAs, s is assigned to a first P-CSCF 4 module, which in turn is assigned a first S- module.
  • CSCF 5 so that a request generated in a UA 1, 2 is received in the first S-CSCF 5 module that accesses an ENUM DNS 6 module through an ENUM request, so that the ENUM DNS 6 module delivers a list of SIP URI assigned to the TEL URI asked.
  • the first S-CSCF module determines the URI to which the originated call should be routed, and sends the request to a second S-CSCF 7 module assigned to the user terminal to which the call is made. called, which handles the signaling for the user terminal and routes the request to a second P-CSCF 8 module assigned to said second S-CSCF 7 module.
  • the called user can be reached in a user terminal UA 9 connected via internet 3 or a UA 10 of a mobile network.
  • the second P-CSCF 8 module routes the call to the PSTN network, using a BGCF 12 that translates the SIP commands into signaling of the PSTN by means of an MGW 14 and an MGCF 13, until it reaches the telephone terminal 15 where the call sound is produced.
  • the second P-CSCF module 8 directs the request to an IBCF element, which will use an IWF to translate the SIP commands into H.323 commands. This possibility has not been represented in the figures.
  • FIG 1 shows the most important modules of the IMS network, which are of interest in the ENUM mechanism, having omitted some of these modules, due to their simplicity and readability that are not necessary to understand the operation of the invention, such as This is the case of the Subscriber Subscription Storage Service (HSS) module and the Interrogating Call Session Control Function (I-CSCF) module.
  • HSS Subscriber Subscription Storage Service
  • I-CSCF Interrogating Call Session Control Function
  • AS application servers
  • UA 1 or 2 sends 16 an INVITE request to the first P-CSCF 4 module assigned to said UA 1 6 2 that makes the request, so that it answers 17 with an indicative signal that it is trying, and at the same time 18 sends the request to the first S-CSCF 5 module to which the first P-CSCF 4 module is associated.
  • the first S-CSCF 5 module converts the TEL URI into an E.164 number (ENUM) and issues a NAPTR question to the ENUM 6 DNS module, requesting a list of mapped URIs to the request made. At the same time it returns 19 an indicative signal that it is trying.
  • the DNS of ENUM 6 returns a 21 NAPTR response containing the list of URIs mapped to the requested TEL URI.
  • the first S-CSCF 5 module obtains the expected SIP URI from the received list and retransmits the INVITE request 22 to the second S-CSCF 7 module assigned to the called user's terminal, storing the selected URI SIP in the URL request command parameter .
  • the role of the I-CSCF module has been omitted because it is not necessary for the understanding of the invention, but strictly the first S-CSCF module would identify an I-CSCF module and it issues the messages to the second S-CSCF module assigned to the user terminal called.
  • the second S-CSCF 7 module answers 23 to the first S-CSCF 5 module with the signal indicating that it is trying, and sends 24 the request to the second P-CSCF 8 module to which the called user terminal 9, 10 is connected. , answering 25 the second P-CSCF module 8 with an indicative signal that it is trying, and sends 26 the request to the user's UA 9, 10, so that said UA 9, 10 sends 28 a conformity signal that crosses 29 , 30, 31 and 32 the modules discussed above until it reaches UA 1, 2 that made the call, which in turn answers 33 with an acceptance signal that crosses 34, 35, 36 and 37 in the opposite direction until he arrives again at UA 9, 10 to which he issued the call.
  • the direct data flow is established between UA 1 6 2 that made the call with UA 9 or 10 called. It is important to note that the data flow 38 does not pass through the modules described above, but that the calling UA 1 or 2 and the UA called 9 or 10 are directly connected in the exchange of the data flow, freeing the modules from the IMS network described of the task of interpreting and dealing with that traffic.
  • the conventional system and method described present the drawbacks that were already described in the background section of the invention, which are solved by the invention for which the novelty of the system of the invention resides in which the first S-CSCF module 5 it is connected to an application server (AS 39) that includes an ENUM SIP AS element 40, an ENUM DNS server 41 and a first database 42, so that calling UA 1 6 2 will send 16 an INVITE request to the first P-CSCF module 4 assigned to it, to which it sends a response 17 indicating that it is trying.
  • AS 39 application server
  • the first P-CSCF 4 module retransmits the INVITE request 18 to the first S-CSCF 5 module which, once it receives the request, answers 19 an indicative signal of which is trying and then does not try to solve the TEL URI by interrogating the DNS module of ENUM 6, as if it would be done in the state of the art, but instead retransmits the request to the SIP AS element of ENUM 40 of AS 39.
  • the SIP AS of ENUM 40 converts the TEL URI into an E.164 number and issues 46 a NAPTR question to the DNS of ENUM 41 requesting the URI mapped to that resource.
  • the ENUM DNS 41 returns 47 a NAPTR response that contains the list of mapped URIs to the requested TEL URI.
  • the SIP AS of ENUM 40 after receiving the URI list, issues 48 SQL questions to the first database 42 to retrieve information elements related to those URIs, relevant to the selection task.
  • the retrieved URI will be highlighted as the destination of the call.
  • the information contained in the first database 42 refers to white lists that define that only the users specified in that list can make a call to the end user terminal, black lists that define that the users specified in those lists cannot make a call to the final terminal, or schedules that define which user can be called in what hours and / or what days.
  • the first database 42 responds 49 with SQL responses, so that for each of the URIs the ENUM SIP AS 40 selects the most appropriate URI and sends 50 a new request containing the URI chosen in the URI request parameter to the first S-CSCF 5 module.
  • the ENUM SIP AS of ENUM 40 can ask the presence server 43 about the status of the connection of the available set of the URI, and choose one where the user is active currently.
  • the first S-CSCF 5 module relays 51 to the second S-CSCF 7 module assigned to the called user, which handles the request and issues a response 52 indicating that it is trying and sends 53 the request to the second P-CSCF module 8 associated to the called UA 9 or 10, 55 providing said request to said UA called 9 or 10 which responds 56 with an indicative message that it is trying and then responds with a conformity message 57 crossing 58, 59, 60 and 61 the modules 8, 7, 5, 4 previously commented until the UA 1 6 2 arrives that made the call, which answers with an acceptance message 62 that crosses 63, 64, 65 and 66 in the opposite direction modules 4, 5, 7, 8, and the direct data flow 67 between the calling UA 1 6 2 is established, with the UA 9 or 10 called in an equivalent manner as performed in the prior art as described.
  • the system of the invention may incorporate a second database of the network operator, not shown, in which information complementary to that provided by the ENUM 41 DNS and that provided by the first base is stored of data 42.
  • the SIP AS of ENUM 40 after interrogating the first database 42, performing the interrogation to the second database, and would obtain the URI from the information provided by the DNS of ENUM 41, the first database 42 and the second database.
  • the ENUM 40 SIP AS is connected to an email server 44, in the case in which when detecting a URI that identifies an email address, the SIP AS of ENUM 40 sends, using some conventional mail protocol, a message to the email server 44, which in this case replies indicating that it has received the email, but the SIP AS of ENUM 40 sends through the first S-CSCF 5 and from the first P-CSCF 4 to UA 1 6 2 that made the request, a message indicating that the request could not be answered.
  • the SIP AS of ENUM 40 selects a URI that identifies an email address, in which case it sends the text message to the email server 44, which responds with an indicative response of receiving email, and in this case the SIP AS of ENUM 40 sends to UA 1 6 2 that generated the request, and through the first S-CSCF 5 module and the first P-CSCF 4 module, indicating that the request has been processed correctly.
  • MESSAGE written text message
  • data corresponding to the capabilities of the UAs, s associated with each URI that identifies them, or data corresponding to the capacities prohibited to each URI that identifies them is stored, so that the SIP AS of ENUM 40, upon receiving a request, uses the information contained therein regarding the session description protocol (SDP), which indicates the capabilities with which the UA 1 6 2 making the call wishes to establish a session with the terminal called 9 or 10, so that the SIP AS of ENUM 40 is provided with means to establish a priority of one URI over others or establish a priority to discard a URI over others, depending on the data stored referring to the capabilities of the UA, s.
  • SDP session description protocol
  • the SIP AS of ENUM 40 comprises means for issuing a message to UA 1 6 2 that generated the call indicating that the Resource is not available.
  • the response message includes a new URI with which the UA 1 or 2 that generated the call must contact. This message is sent to the UA that generated call 1 or 2 through the first S-CSCF 4 module and the first P-CSCF 5 module.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention offre de nouvelles prestations d'acheminement en accord avec les préférences de l'utilisateur et de l'opérateur du réseau, conjointement à l'état de connexion de l'utilisateur et des capacités des terminaux appelés. Les nouvelles prestations permettent de déterminer l'acheminement sur la base de listes blanches, listes noires, horaires qui définissent quel utilisateur peut être appelé et à quelles heures et/ou quels jours, ces listes étant établies par l'utilisateur et/ou par l'opérateur du réseau. Pour ce faire, l'invention comprend un serveur d'application AS (39) qui augmente les mécanismes de traduction ENUM (Mappage de numéros E.164) et obtient la destination de l'appel pour l'acheminer en fonction des nouvelles prestations établies.
PCT/ES2010/070066 2010-02-05 2010-02-05 Système et procédé d'acheminement d'appels dans un réseau ims WO2011095652A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/ES2010/070066 WO2011095652A1 (fr) 2010-02-05 2010-02-05 Système et procédé d'acheminement d'appels dans un réseau ims
ARP110100340A AR080104A1 (es) 2010-02-05 2011-02-01 Sistema y metodo de encaminamiento de llamadas en una red ims

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2010/070066 WO2011095652A1 (fr) 2010-02-05 2010-02-05 Système et procédé d'acheminement d'appels dans un réseau ims

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070253417A1 (en) * 2006-04-27 2007-11-01 Nokia Corporation Address translation in a communication system
WO2009149963A1 (fr) * 2008-06-10 2009-12-17 Telefonaktiebolaget Lm Ericsson (Publ) Centre de commutation avec unité de détection d'informations de présence

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070253417A1 (en) * 2006-04-27 2007-11-01 Nokia Corporation Address translation in a communication system
WO2009149963A1 (fr) * 2008-06-10 2009-12-17 Telefonaktiebolaget Lm Ericsson (Publ) Centre de commutation avec unité de détection d'informations de présence

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
G. CAMARILLO ET AL.: "The 3G IP Multimedia Subsystem (IMS): Merging the Internet and the Cellular Worlds.", WILEY *

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