WO2008022613A2 - Procédé pour produire un message de commande d'une session de communication - Google Patents

Procédé pour produire un message de commande d'une session de communication Download PDF

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Publication number
WO2008022613A2
WO2008022613A2 PCT/DE2007/001318 DE2007001318W WO2008022613A2 WO 2008022613 A2 WO2008022613 A2 WO 2008022613A2 DE 2007001318 W DE2007001318 W DE 2007001318W WO 2008022613 A2 WO2008022613 A2 WO 2008022613A2
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WO
WIPO (PCT)
Prior art keywords
communication
call control
message
control protocol
communication session
Prior art date
Application number
PCT/DE2007/001318
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German (de)
English (en)
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WO2008022613A3 (fr
Inventor
Frank Kowalewski
Holger Schmidt
Original Assignee
Infineon Technologies Ag
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 Infineon Technologies Ag filed Critical Infineon Technologies Ag
Publication of WO2008022613A2 publication Critical patent/WO2008022613A2/fr
Publication of WO2008022613A3 publication Critical patent/WO2008022613A3/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
    • H04L65/40—Support for services or applications
    • H04L65/403—Arrangements for multi-party communication, e.g. for conferences
    • 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]

Definitions

  • the invention relates to a method for generating a communication session control message, a method for controlling a communication session with a plurality of communication terminals, a communication session control message generation unit, a communication terminal
  • the 3rd Generation Partnership Project (3GPP) has developed a standard for the Internet Protocol Multimedia Core Network Subsystem (IMS) architecture.
  • IMS Internet Protocol Multimedia Core Network Subsystem
  • Session Initiation Protocol In various communication services based on the IMS standard developed by the 3GPP, the Session Initiation Protocol (SIP) is used to establish a communication connection between two or more SIP.
  • SIP Session Initiation Protocol
  • 25 communication terminals for example, to set up a conference between two or more communication terminals.
  • a method for generating a communication session control message in which a call control protocol message is generated in accordance with the SIP protocol, wherein the call control protocol message control information 2, which specifies, for a communication session with a plurality of communication terminals, at least one communication terminal to be removed from the communication session, the control information being provided in an area of the call control protocol message outside an addressing range in which an address of a communication terminal to be removed is specified.
  • FIG. 1 shows a communication system according to an exemplary embodiment of the invention
  • FIG. 4 shows a flowchart according to an embodiment 25 of the invention.
  • FIG. 5 is a flowchart according to an embodiment of the invention.
  • An IMS that is a communication network according to the IMS standard developed by the 3GPP, makes it possible to provide various communication services based on the Internet Protocol (IP) to a mobile terminal.
  • IP Internet Protocol
  • Such communication services include Voice over Internet Protocol (VoIP), video telephony and conferencing, for example.
  • VoIP Voice over Internet Protocol
  • video telephony For example, telephone conferences or push-to-talk sessions (PTT).
  • PTT push-to-talk sessions
  • WLAN wireless local area network
  • GPRS General Packet Radio Service
  • UMTS Universal Mobile 10 Telecommunications System
  • an IMS enables a wide variety of communication services to be made available to a broad user base.
  • the conference service provides methods
  • audio conferencing video conferencing
  • 35 instant messaging conferences such as chat conferencing
  • gaming (game) conferencing can be provided.
  • a star-shaped conference architecture of a communication system in which all conference participants are coupled by means of signaling links with a conference control program which controls the conference and which is executed on a so-called (conference) focus.
  • the focus thus represents a logical unit in the IMS.
  • a conference address referred to herein as a Conference Uniform Resource Indicator (C-URI)
  • C-URI Conference Uniform Resource Indicator
  • the conference address represents the conference, and a user of the communication system may join the conference using the conference address, for example.
  • the Focus has access to the Conference Policy, which manages a Conference Policy Server (CPS).
  • CPS Conference Policy Server
  • the Focus has the task of providing the conference-specific distribution of the media content to the conference participants.
  • two SIP procedures are provided, that is, two SIP-based procedures.
  • the user wishing to create the conference sends a "SIP INVITE" message to the conference factory URI. 35 5
  • the Conference Factory URI is the address of a conferencing server, that is, a server that can create and manage conferences with the associated focus.
  • SIP communication session The successful establishment of a SIP session (hereinafter also referred to as SIP communication session) with the conference server results in the generation of a focus, a C-URI assigned to it and thus a conference.
  • a conference is created 20 if it does not yet exist. This reserves the resources required for a conference and then enables them.
  • Focus For the Focus, one difference is that it activates a reserved conference or adds a user to an existing conference. It is possible that entire address ranges may be reserved for conferences, such as a complete domain (e.g., conf.vodafone.com) or subdomains 5 (e.g., the address range of conferencel@conf.vodafone.com to conference9999@conf.vodafone.com).
  • a complete domain e.g., conf.vodafone.com
  • subdomains 5 e.g., the address range of conferencel@conf.vodafone.com to conference9999@conf.vodafone.com.
  • Ending a conference by a user would mean removing all participants from the conference. This is often synonymous with the resolution 15 of the signaling connection (SIP session) between the conference participants and the Focus.
  • SIP session signaling connection
  • a conference is not ended until all participants have left the conference. This is for example disadvantageous if a user has a
  • SIP-BYE Participation of a user in a conference by means of SIP messages, the SIP dialogue and thus the SIP session (also referred to as SIP communication session) between the conference participant and the Focus by means of a "SIP-BYE"
  • a specific SIP address can be specified in an address range of the REFER message, or an address of the form
  • a conference will therefore only be terminated if, as mentioned above, all participants in the conference have left the conference. This is particularly disadvantageous not only for tariff reasons, as described above, if a user pays the conference, but also in view of the 5 completeness of the SIP procedures and the SIP functionality within the conference service of the IMS.
  • a user or user agent client (UAC) used by the ten user can specify preferences for how his request should be handled.
  • Preferences of the first type are called “request handling preferences" and give the server special instructions on how to handle the request.
  • the instructions are transmitted in the message header field (header) with the designation "request-disposition" of a SIP 30 request (SIP request).
  • Preferences of the second type are referred to as "feature preferences" and allow the user sending a SIP request to specify a set of features that describes what properties the called user's UA (User Agent) should have.
  • SIP requests SIP requests
  • SIP responses SIP responses
  • UAC user agent client
  • UAS User Agent Server
  • each communication terminal includes a 10 UA.
  • the message header field named Accept-Contact and the message header field named Rejsct-Contact 15 are used.
  • feature tags that is to say by means of specific identifiers (tags) in the mentioned 20 message header digits, for example by means of so-called base tags (base tags), which are part of SIP to be provided.
  • the properties required of a calling user are compared with the characteristics of the UA associated with each contact address of the called user.
  • the request of the calling user is forwarded to this contact address.
  • this method is used to indicate that a UA is a focus.
  • the UA inserts the SIP feature tag named "isfocus", which is a base tag, as a parameter into the Contact Header message header field of a SIP message transmitted to another UA.
  • the other UA receiving the SIP 10 message with the corresponding "Contact Header” recognizes that the UA that sent the SIP message is a Focus and has corresponding functions.
  • a conference participant may request a focus, a SIP message specified within a REFER message, for example a BYE message or an INVITE message, as described below, to one in the REFER message specified address, eg in the form of a SIP 20 URI.
  • a SIP message specified within a REFER message for example a BYE message or an INVITE message, as described below.
  • the focus can be requested by a conference participant, for example, to send a SIP INVITE message to a specific N ⁇ tzer or its UA 25. This user is thus invited to join the conference.
  • the user is thus invited by the conference participant who sent the REFER message to the focus.
  • the focus may also be requested by a conference participant, for example, to send a SIP-BYE message to a specific user or his UA. This user will look like this
  • the user is causally removed by the conference participant who sent the REFER message to the focus.
  • FIG. 5 shows a communication system 100 according to an embodiment of the invention.
  • the communication system 100 is implemented according to the UMTS architecture described by 3GPP, whose integral
  • the communication system 100 also according to another architecture, such as another mobile radio architecture or a fixed network architecture,
  • a communication terminal 101 is coupled to an IMS 111 via an access network 102.
  • any number 20 ' of communication terminals are included in the communication system 100 and can communicate with each other via the communication system 100.
  • the access network 102 may include, for example
  • UMTS Universal Terrestrial Access Network
  • GSM GSM EDGE Radio Access Network
  • the access network 102 may also be a landline network, for example, the communication terminal 101 may include a device that allows access to the Internet, for example a DSL (Digital Subscriber Line),
  • DSL Digital Subscriber Line
  • the communication terminal is coupled to the IMS 111 via the Internet. 12
  • the communication terminal 101 is, for example, a mobile telephone or a computer with or without a mobile radio module.
  • the access network 102 is a mobile radio communication system according to the UMTS communication standard.
  • a mobile radio network 112 of the access network 102 has the architecture of a UMTS radio network, which is also known as UMTS radio network.
  • UTRAN Terrestrial Radio Access Network
  • the access network 102 has a PS domain 140, which consists of the
  • SGSN Server GPRS Support Node
  • GGSN Gateway GPRS Support Node
  • IMS 111 IMS 111
  • the PS domain 140 performs all functions to ensure the transport of packet-switched data. Furthermore, it enables the transport of signaling messages to the IMS.
  • the access network further comprises an HLR 141, which is a central database in which all information is stored by subscribers required, inter alia, to establish a connection and to manage services
  • the communication terminal 102 is coupled to a P-CSCF (CSCF: Call Session Control Function, P-CSCF: Proxy-CSCF) 103 of the IMS 111. 35 13
  • P-CSCF Call Session Control Function
  • P-CSCF Proxy-CSCF
  • the P-CSCF 103 serves as an exchange and is coupled to a DNS (Domain Name Server) 104 and an I-CSCF (Interrogating CSCF) 105.
  • DNS Domain Name Server
  • I-CSCF Interrogating CSCF
  • the I-CSCF 105 is coupled to an HSS 106 (Home Subscriber Server) 106 and an S-CSCF (Serving CSCF) 107.
  • HSS 106 Home Subscriber Server
  • S-CSCF Serving CSCF
  • the S-CSCF 107 is coupled to a plurality of application servers (AS, Application Server), of which only one application server 138 is shown.
  • AS Application Server
  • the S-CSCF 107 is further coupled to an MRFC (Media Resource Function Controller) 142.
  • MRFC Media Resource Function Controller
  • the communication terminal 101, the access network 102, the P-CSCF 103 and the DNS 104 are parts of the visited network 20 (V-PLMN) 109.
  • the I-CSCF 105, the HSS 106, the S-CSCF 107 and the application server AS 138 and optionally the MRFC 142 are part of the Home Communications Network (H-PLMN) 108.
  • H-PLMN Home Communications Network
  • the P-CSCF 103, the I-CSCF 105, the HSS 106, and the S-CSCF 107 are part of the IMS (IP Multimedia Core Network Subsystem) 111. In another embodiment of the invention, it is contemplated .
  • IMS IP Multimedia Core Network Subsystem
  • the P-CSCF 103, the I-CSCF 105, the HSS 106 and the S-CSCF 107 are located outside of the IP Multimedia Core Network Subsystem 111.
  • a user can use the 35 communication services of the IMS 111, for example an "instant message" to another communication terminal coupled to the communication system 100 14 or perform a conference with users of other communication terminals coupled to the communication system 100.
  • FIG. 5 shows a communication system 200 according to another embodiment of the invention.
  • the communication system 200 according to the exemplary embodiment illustrated in FIG. 2 is configured according to the push-to-talk over cellular
  • the participants or the communication terminals of the participants in a conference do not communicate directly with each other, but via a central PTT server.
  • OMA Open Mobile Alliance
  • a PTT server 201 and four communication terminals 202, 203, 204, 205 (also referred to as subscriber terminals), namely a first communication terminal 202, a second
  • Communication terminal 204 and a fourth communication terminal 205 which participate in a PTT session (hereinafter also referred to as conference).
  • 25 202, 203, 204, 205 communicate by audio.
  • the communication terminals 202, 203, 204, 205 communicate alternatively or additionally by video.
  • 35 communication terminal 202 generates the PTT session by the other participants (for example, second party T2, third party T3 and fourth party T4) and their 15
  • Communication terminals for example, second communication terminal 203, third communication terminal 204 and fourth communication terminal 205 to the PTT session invites.
  • the first participant T1 is thus automatically authorized to remove the other participants from the PTT session.
  • Tl Participants Tl discuss the results further with other participants. For this Tl selects at his communication terminal the option of all subscribers (except Tl), i. in this' embodiment of the invention, the second subscriber T2,
  • the first communication terminal 202 of the first 20 subscriber Tl sends a SIP REFER message to the PTT server 201.
  • the SIP REFER message contains the SIP address of one of the subscribers of the PTT session (here, for example, the SIP address of the second subscriber T2) as a refer-to address.
  • the address of the second subscriber T2 is indicated in an address area of the message shown (see in the message "Refer-To: ⁇ sip: T2; ...>"). With this address
  • 25 communication terminal 203 (generally to the subscriber or its communication terminal, which is specified in the address range of the refer-to field) should send a SIP BYE message.
  • SIP messages with special information to identify all participants in a communication session by one of the participants from the session (e.g., a PTT session, generally one
  • any SIP-controlled session except for one or more designated subscribers.
  • the special information indicates that all participants should be removed from the session except for one or more dedicated subscribers.
  • a subscriber may send a SIP REFER message to the central server (eg, PTT server 201, as an alternative to the focus of a conference in a
  • the REFER message has the structure of a normal REFER message for removing a single other subscriber (addressed in an address range of the REFER message) from the session with an additional special parameter (included outside 18 of the address range) signaling the desire to remove all participants from the session to one or more dedicated subscribers.
  • the additional parameter can be specified, for example, as an additional generic parameter in the refer-to-header field or as text in the body of the REFER message.
  • Refer-To Address represents all participants in the session except for one or more designated participants.
  • the refer-to address refers to a specific instruction, with the removal of all participants except for the first participant
  • the REFER message could use the refer-to address "ParticipantsExceptTl.SessionID" to indicate that in the conference (otherwise
  • a predeterminable number of subscribers are to be removed from the communication session, wherein an arbitrarily predeterminable number of subscribers or their communication terminals are excluded from the removal
  • An advantage of an embodiment of the invention can be seen in the fact that the participants of a communication session with a single SIP message can be removed from the session. This is the
  • SIP messages used conform to the SIP specification because they do not use a universal selector "* ⁇ in the host 30 part of the refer-to address.
  • the message type also corresponds to the previously commonly used SIP message to send individual subscribers of a communication session from the
  • An embodiment of the invention also has the advantage that the solution can be used with devices that do not understand the proposed special signaling. According to the conventional SIP specification, such devices simply ignore the signaling.
  • FIG. 3 shows a message flow diagram 300 according to an embodiment of the invention.
  • the message flow shown in Figure 3 takes place between a first communication terminal 301, a P-CSCF 302, 20 which is part of a visited network 303, an S-CSCF 304 and an application server 306, which is part of the 'home network 305 are of the communication terminal, and a second communication terminal 322 instead.
  • the application server 306 in this embodiment is a conference server.
  • the SIP-REFER method is used to terminate a conference.
  • the user of the communication terminal 301 sends a SIP "REFER" message containing a C-URI to the P-CSCF 302 via the communication terminal 301.
  • the REFER message is constructed in the same or similar manner as the REFER message shown in Table 1, as described above. 21
  • the P-CSCF 302 forwards the REFER message to the S-10 CSCF 304.
  • the S-CSCF 304 forwards the REFER message to the application server 306, which provides the focus 321.
  • Focus 321 checks to see if the referral
  • the focus 321 terminates the communication session corresponding to the C-URI for all subscribers of the communication session except for the first subscriber Tl or Tl. its communication terminal 202, as in the Refer-to-25 message header field in the REFER message the
  • the focus 321 transmits to the communication terminal 301 an acknowledgment for the receipt of the REFER message 30 by means of a "202 Accepted" SIP message, which is transmitted to the S-CSCF 304.
  • the S-CSCF 304 forwards the accepted message to the P-CSCF 302, which transmits the accepted message in 313 to the communication terminal 301. 22
  • the focus 321 ends the communication session for all participants 5 except for the first one Participants Tl, by the SIP dialogues to all conference participants or their,
  • the focus 321 sends a message labeled "BYE" to the S-CSCF 304 for forwarding to the second communication terminal 322.
  • the S-CSCF 304 forwards the BYE message to the P-CSCF 20 302, which transmits the BYE message to the second communication terminal 322 in step 317.
  • the second communication terminal 322 acknowledges receipt of the BYE message by transmitting a message labeled "200 OK" to the P-CSCF 302 for forwarding to the application server 306.
  • the P-CSCF 302 forwards the OK message to the S-CSCF 304, which transmits the OK message in 320 to the Focus 321 30.
  • the focus 321 transmits to all communication session participants except the first user Tl a BYE message, since the communication terminals of all
  • Communication session by the first participant Tl the communication session can be terminated easily and cost-effectively targeted.
  • Embodiment of the invention the removal of the participants or their communication terminals the
  • the communication session persists, but temporarily without participants. At a later time, participants can again join the communication session and the communication can be continued in the same communication session with the same session ID. In this
  • Targeted removal of the subscribers may be achieved as described using only a single REFER message sent by the user, using a very simple additional command in a SIP message.
  • the at least one conference provided by the conference server (as an example of a communication session) is a multimedia conference, for example an audio conference,
  • a video conference an instant messaging conference, such as a chat conference, or a gaming (game) conference.
  • FIG. 4 shows in a flowchart 400 a method for controlling a communication session with a plurality of communication terminals according to an embodiment of the invention. 5
  • control information is determined from a received call control protocol message according to the SIP protocol, with which for a communication session with a.
  • Plurality of communication terminals at least one
  • control information is provided in an area of the call control protocol message outside an addressing area in which an address of an
  • the at least one communication terminal is removed from the communication session. 20
  • Tl and T2 in the message shown stand for the SIP addresses of the communication terminal of the first subscriber Tl and the second subscriber T2.
  • Table 3 Alternative REFER message for removing all participants from the communication session, except for the first 20 participants Tl
  • Tl ⁇ and T2 M in the message shown stand for the SIP addresses of the communication terminal of the first subscriber Tl and the second subscriber T2.
  • the REFER message may also include a special refer-to address.
  • the address may also include a special refer-to address.
  • the address may be from the 26
  • Session ID "SessionID” and an addition may be formed, for example: "ParticipantsExceptTl.SessionID”. In this case, all participants except the first participant Tl are removed from the communication session.
  • the following table 4 shows the corresponding REFER message.
  • Tl in the message shown stands for the 15 SIP address of the communication terminal of the first
  • SessionID stands for the SIP address of the communication session.
  • the distance can also be signaled with a SIP MESSAGE message.
  • Tl stands for the SIP address of the communication terminal of the first subscriber Tl.
  • Tl and T2 stand for the SIP addresses of the communication terminal of the first subscriber Tl and the second subscriber T2.
  • the invention is not limited to a PTT system. As described above, it may also be used in other multi-party communication systems, for example in other conferencing systems, such as e.g. in
  • FIG. 5 shows in a flow diagram 500 a method for. Controlling a communication session with a plurality of communication terminals according to an embodiment of the invention.
  • address information is determined from a received call control protocol message in accordance with the SIP protocol, with which for a communication session with a
  • 25 plurality of communication terminals at least one
  • Communication terminal is specified, to which the call control protocol message is to be applied, wherein the address information is provided in an area of the call control protocol message outside of one
  • the call control protocol message is applied to the at least one communication terminal.
  • a method of generating a communication session control message comprising generating a call control protocol message in accordance with the SIP protocol, wherein the call control protocol message includes control information
  • control information in a range of call control
  • protocol message is provided outside of an addressing area in which an address of a communication terminal to be removed can be specified.
  • a communication terminal to be removed can be specified in the 20 addressing range.
  • control information contains an instruction indicating that a predeterminable number of communication terminals should be removed from the communication session.
  • control information includes an instruction to indicate that all communication terminals should be removed from the communication session.
  • control information contains an instruction indicating that all the communication terminals are from the
  • 35 communication session are to be removed except for one or more predetermined communication terminals.
  • control information contains an instruction indicating that all the communication terminals are from the
  • the control information can be inserted in the form of a referencing in the call control protocol message.
  • the referencing can be inserted in the refer-to-message header field.
  • the at least one communication session provided by the conference server may be a multimedia communication session.
  • the call control protocol message contains control information with which at least one communication session with a plurality of communication terminals
  • control information is provided in an area of the call control protocol message outside an addressing area in which an address of an
  • the communication session control message generating unit is further configured such that one of the
  • 35 communication session to be removed communication terminal is specified in the addressing area.
  • the communication session control message generating unit is further configured such that the control information includes an instruction indicating that a predetermined number of communication terminals should be removed from the communication session.
  • the communication session control message generating unit 10 is further configured such that the control information includes an instruction indicating that all communication terminals should be removed from the communication session.
  • Communication session control message generating unit further configured such that the control information includes an instruction that indicates that all communication terminals from the communication session
  • the communication session control message generating unit is
  • control information includes an instruction indicating that all communication terminals should be removed from the Kornmunikationsssitzung except for the call control protocol message generating communication terminal.
  • a communication terminal of a communication system is provided.
  • the communication terminal points to a conference control message generation unit for generating
  • Communication session is specified with a plurality of communication terminals at least one communication terminal to be removed from the communication session, wherein the 5 control information is provided in an area of the call control protocol message outside of an addressing range in which specifies an address of a communication terminal to be removed becomes.
  • a communication session controller of a communication system is provided.
  • the communication session control unit points to a determination device that is set up from a
  • control information is provided in an area of the call control protocol message outside an address range in which an address of a communication terminal to be removed is specified, and a
  • a method for controlling a communication session with a plurality of communication terminals comprises determining, from a received call control protocol message in accordance with the SIP protocol of control information, with which for a communication session with a plurality of communication terminals at least one communication terminal is specified, which is to be removed from the communication session, the 33
  • Control information is provided in an area of the call control protocol message outside of an addressing area in which an address of a communication terminal to be removed is indicated, and a removal according to the determined control information of the at least one communication terminal from the communication session.
  • a method of generating a communication session control message comprising generating a call control protocol message in accordance with the SIP protocol, the call control protocol message including control information with which for a communication session with a plurality of communication terminals, indicating at least one communication terminal to be removed from the communication session, the control information being an address included in the call control protocol message and with an instruction is referenced to remove a predetermined number of communication terminals from the communication session.
  • the instruction may include an instruction to indicate that all communication terminals should be removed from the communication session.
  • the instruction may include an instruction to the 30 indicated 1, is that all communication terminals from the
  • Communication session are to be removed except for one or more predetermined communication terminals.
  • the instruction may include an instruction to indicate that all communication terminals are from the
  • a control message comprising generating a call control protocol message in accordance with the SIP protocol, wherein the call control protocol message contains control information with which for a communication session with a
  • the control information may include an instruction to indicate that all communication terminals should be removed from the communication session except for the one generating the call control protocol message

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  • Computer Networks & Wireless Communication (AREA)
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  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé permettant de produire un message de commande de session de communication, dans un système intégré de gestion ou un système de messagerie instantanée vocale, selon lequel un message de protocole de commande d'appel est produit, conformément au protocole SIP. Le message de protocole de commande d'appel contient une information d'adresse devant servir à spécifier, pour une session de communication impliquant une pluralité de terminaux de communication, au moins un terminal de communication sur lequel le message de protocole de commande d'appel doit être utilisé. L'information d'adresse est prévue dans une zone du message de protocole de commande d'appel située en dehors du la zone d'adressage, dans laquelle l'adresse d'un terminal de communication peut être spécifiée.
PCT/DE2007/001318 2006-08-11 2007-07-25 Procédé pour produire un message de commande d'une session de communication WO2008022613A2 (fr)

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DE200610037749 DE102006037749A1 (de) 2006-08-11 2006-08-11 Verfahren zum Erzeugen einer Kommunikationssitzung-Steuernachricht, Verfahren zum Steuern einer Kommunikationssitzung mit mehreren Kommunikationsendgeräten, Kommunikationssitzung-Steuernachricht-Erzeugungseinheit, Kommunikationsendgerät und Kommunikationssitzung-Steuereinheit

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