EP1897321A1 - Method for controlling the user facility "sip call-transfer" - Google Patents

Method for controlling the user facility "sip call-transfer"

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Publication number
EP1897321A1
EP1897321A1 EP06763464A EP06763464A EP1897321A1 EP 1897321 A1 EP1897321 A1 EP 1897321A1 EP 06763464 A EP06763464 A EP 06763464A EP 06763464 A EP06763464 A EP 06763464A EP 1897321 A1 EP1897321 A1 EP 1897321A1
Authority
EP
European Patent Office
Prior art keywords
sdp
sip
isup
protocol element
endpoint
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP06763464A
Other languages
German (de)
French (fr)
Inventor
Klaus Hoffmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks GmbH and Co KG
Original Assignee
Nokia Siemens Networks GmbH and Co KG
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 Nokia Siemens Networks GmbH and Co KG filed Critical Nokia Siemens Networks GmbH and Co KG
Publication of EP1897321A1 publication Critical patent/EP1897321A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party
    • 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
    • H04L65/1083—In-session procedures
    • 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
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H04M7/125—Details of gateway equipment
    • H04M7/1255—Details of gateway equipment where the switching fabric and the switching logic are decomposed such as in Media Gateway Control

Definitions

  • Newer communication architectures provide for the separation of switching networks in connection service-related units and the transport of the user information (Bearer Control). This results in a decomposition / separation of connection establishment and medium or. Bearer setup.
  • the transmission of the payload information can take place via different high bit rate transport technologies, such as e.g. ATM, IP or Frame Relay.
  • the telecommunications services currently operated in narrowband networks can also be implemented in broadband networks.
  • the subscribers are connected either directly (for example via a DSS1 protocol) or via exchanges designed as media gateway controllers (MGC) (for example via the ISUP protocol).
  • MSC media gateway controllers
  • the payload itself is converted by media gateways (MG) into the respective transport technology used.
  • the control of the media gateways are performed by respectively assigned media gateway controllers (MGC).
  • MMC media gateway controllers
  • the media gateway controllers use standardized protocols, such as: As the MGCP protocol or the H.248 protocol.
  • the media gateway controllers use a standardized by the ITU BICC (Bearer Independent Call Control) protocol, which is formed of a plurality of standardized protocols and thus includes a protocol family.
  • Standardization body with the SIP protocol (RFC3261) or the addition SIP-T (RFC3204) emerged. With the latter you can ISUP messages - in contrast to the SIP protocol - are transmitted. ISUP messages are generally transmitted through tunnels, ie through transparent transmission.
  • SDP Session Desing Protocol
  • SDP data is bearer-endpoint-related data that contains information about codecs, IP port, IP address, and so on.
  • the I-IWU should send the IAM upon receipt of the SDP answer with media descrip- tion.
  • the invention has for its object to show a way how the feature "SIP call transfer" can be efficiently implemented.
  • the advantage of the invention can be seen in the fact that the ISUP message IAM is sent earlier to the (third) subscriber with the aid of the ISUP protocol element "continuity on prevision circuit."
  • the proposed solution thus achieves the required memory space the call is set up faster and at the same time the subscriber is not called until the IP bearer connection has been established, the latter being of great importance with regard to the security of this connection.
  • FIG. 1 shows the basic relationships between 2 PSTN
  • a network configuration is shown, on which the inventive method comes to drain.
  • two PSTN networks are disclosed, in each of which a plurality of PSTN subscribers are arranged in a known manner. These are brought to local exchanges LE, which in turn are connected to transit exchanges TX.
  • the signaling information is supplied from the transit exchange TX directly via an ISUP protocol to a respectively assigned media gateway controller MGC (MGC A or MGC B).
  • MGC media gateway controller
  • the payload information is transmitted to a (on the input side) arranged Media Gateway MG (MG A or MG B), which acts as an interface between the TDM network and an ATM or IP transmission network and are transmitted packet-oriented over the relevant transmission network.
  • the media gateway MG A is controlled by the media gateway controller MGC A as well as the media gateway MG B by the media gateway controller MGC B.
  • the payload information again under the control of the media gateway MG B assigned Media Gateway Controller MGC B are converted into a TDM data stream and fed to the candidate PSTN participants.
  • the data transmitted between the media gateway controller MGC and the respectively assigned media gateway is provided by a standardized protocol supported. This can be, for example, the MGCP or the H.248 protocol.
  • the SIP protocol is preferably used according to the present embodiment. In the signaling path, other devices such as SIP proxies or SIP units SIP E can be switched.
  • FIG. 2 shows a configuration in which SIP call transfer scenarios take place. Accordingly, SIP
  • SIP subscriber B now wants to terminate the communication with SIP subscriber A and connect SIP subscriber A with subscriber C (call transfer). It should be noted that the latter - according to the present embodiment) - is arranged in a classic TDM network. SIP subscriber B now submits the information required for the feature "call transfer" (without consultation) to an application server AS in the form of a SIP protocol element "SIP: REFER to C". The Application Server AS now sends the
  • Endpoint is, of course, a SIP end point, in this case the media gateway controller MGC.
  • the table below shows the SIP protocol elements required to implement the SIP Call Transfer feature.
  • the media gateway controller MGC then contacts the associated media gateway MG, takes over the SDP data from there and acknowledges the A-side with the SIP protocol element. "Provisional Response" the SDP data of the subscriber C from the deputy media gateway MG
  • the media gateway controller MGC transfers according to the invention the next ISUP switching center in the direction of the subscriber C an IAM message with the ISUP protocol element "Continuity on prevision circuit" ,
  • This ISUP protocol element is a message that is commonly used for the end-user continuity check. It leads to the fact that at the participant C still no ringtone is initiated, thus this is not yet called.
  • the A-side acknowledges receipt of the "Provisional Response” using the PRACK method with the SDP data of the A-side (ie the A-subscriber) of the Media Gateway Controller MGC, at the same time the bearer connection between the end-point of subscriber A and Subscriber C.
  • the media gateway controller MGC now hands over the ISUP protocol element "continuity (COT)" and has subscriber C called.
  • COT continuity
  • the termination of the connection establishment now takes place in accordance with the standard by exchanging the SIP protocol element 200 OK, ACM (Address Compete Message) and ANM.
  • the I-IWU should send the IAM with the indication "continuity check on previus circuit" and will send upon receipt of the SDP answer with media description the COT message.
  • the invention can also be applied if there is no ISUP / SIP between the PSTN subscriber (ISDN, analog subscriber or mobile subscriber) and the SIP or SIP-T subscriber. This means that the above procedure then takes place within the central office.
  • NextGenerationNetwork subscribers such as VoDSL, H323 etc. to SIP or SIP-T is also possible.
  • the application of the ISUP with IAM and COT has been described.
  • the invention is not limited to this, as there may of course also be a direct interworking of SIP on DSSl or TUP etc., where no ISUP would exist on the C-subscriber.
  • the described mechanisms can also be used there in a general form. So z.
  • a sinalization type not equal to ISUP which does not have the "IAM with continuity on this / on previuos circuit" simply does not yet send the last dialed digit so that the subscriber can not yet be called. Only when the SDP has come answer would e.g. then this number in the signaling (SAM: Subsequent address message in ISUP language) would be submitted later. Only with this last selected digit can the target office then select / reach the actual participant, which only now would ring.
  • SAM Subsequent address message in ISUP language

Abstract

In prior art, according to the ITU-T recommendation Q.1912.5, chapter 6.1.1 (1)(a), to implement the user facility IP call transfer , if SIP preconditions are not in use, the media gateway controller (I-IWU) only sends the ISUP message IAM to a called (third) subscriber upon receipt of the SDP data. However, said procedure has definitive disadvantages in terms of additional memory requirements in the media gateway controller, leading to call delays. The invention solves the problem in the following way: the IAM message, together with the ISUP protocol element continuity check on previous circuit are transmitted to the ISUP subscriber and the bearer connection is only established upon receipt of the SDP data from the A-side.

Description

Beschreibungdescription
Verfahren zur Steuerung des Leistungsmerkmals "SIP CaIl- Transfer"Method for controlling the feature "SIP call transfer"
Neuere Kommunikationsarchitekturen sehen die Trennung vermittlungstechnischer Netzwerke in verbindungsdienstbezogene Einheiten und den Transport der Nutzinformationen (Bearer Control) vor. Hieraus resultiert eine Dekomposition/ Trennung von Verbindungsaufbau und Medium-bzw. Beareraufbau. Die Übertragung der Nutzinformationen (Durchschaltung des Nutzkanals) kann dabei über unterschiedliche hochbitratige Transporttechnologien wie z.B. ATM, IP oder Frame Relay vorgenommen werden.Newer communication architectures provide for the separation of switching networks in connection service-related units and the transport of the user information (Bearer Control). This results in a decomposition / separation of connection establishment and medium or. Bearer setup. The transmission of the payload information (throughput of the payload channel) can take place via different high bit rate transport technologies, such as e.g. ATM, IP or Frame Relay.
Mit einer derartigen Trennung sind die gegenwärtig in Schmalbandnetzen geführten Telekommunikationsdienste auch in Breitbandnetzen zu realisieren. Dabei werden die Teilnehmer entweder direkt (z.B. über ein DSSl-Protokoll) oder über als Media Gateway Controller (MGC) ausgebildete Vermittlungsstellen (z. B. über das ISUP-Protokoll) angeschlossen. Die Nutzinformationen selbst werden über von Media Gateways (MG) in die jeweils benutzte Transporttechnologie umgewandelt.With such a separation, the telecommunications services currently operated in narrowband networks can also be implemented in broadband networks. In this case, the subscribers are connected either directly (for example via a DSS1 protocol) or via exchanges designed as media gateway controllers (MGC) (for example via the ISUP protocol). The payload itself is converted by media gateways (MG) into the respective transport technology used.
Die Steuerung der Media Gateways werden von jeweils zugeordneten Media Gateway Controllern (MGC) durchgeführt. Zur Steuerung der Media Gateways verwenden die Media Gateway Controller normierte Protokolle, wie z. B. das MGCP Protokoll oder das H.248 Protokoll. Zur Kommunikation untereinander verwen- den die Media Gateway Controller ein durch die ITU standardisiertes BICC (Bearer Independent CaIl Control) Protokoll, das aus einer Mehrzahl von standardisierten Protokollen gebildet ist und somit eine Protokollfamilie umfasst.The control of the media gateways are performed by respectively assigned media gateway controllers (MGC). To control the media gateways, the media gateway controllers use standardized protocols, such as: As the MGCP protocol or the H.248 protocol. To communicate with each other, the media gateway controllers use a standardized by the ITU BICC (Bearer Independent Call Control) protocol, which is formed of a plurality of standardized protocols and thus includes a protocol family.
Ein dem BICC Protokoll adäquates Protokoll ist bei dem IETFAn adequate protocol to the BICC protocol is the IETF
Standardisierungsgremium mit dem SIP Protokoll (RFC3261) bzw. dem Zusatz SIP-T (RFC3204) entstanden. Mit letzterem können ISUP-Nachrichten - im Gegensatz zum SIP Protokoll - übertragen werden. Die Übertragung der ISUP-Nachrichten erfolgt im Allgemeinen durch Tunnel, d. h. durch transparentes Durchreichen.Standardization body with the SIP protocol (RFC3261) or the addition SIP-T (RFC3204) emerged. With the latter you can ISUP messages - in contrast to the SIP protocol - are transmitted. ISUP messages are generally transmitted through tunnels, ie through transparent transmission.
Der Verbindungsaufbau zwischen 2 oder mehreren SIP-Teil- nehmern erfolgt unter Zuhilfenahme von SIP-Protokoll- elementen. Hierbei werden unter anderem SDP (Session Descrip- tion Protocol) Daten ausgetauscht. SDP-Daten sind (Bearer-) endpunktbezogene Daten, die Informationen über Codecs, IP- Port, IP-Adresse usw. enthalten. Soll eine Verbindung zwischen einem SIP-Teilnehmer und einem H.323 oder TDM/ ISDN Teilnehmer erstellt werden, müssen diese SIP-Protokollele- mente in den beteiligten Media Gateway Controllern entspre- chend in H.323-, TDM- oder ISDN Protokollelemente umgesetzt werden. Beispielsweise bedeutet dies für einen aus der SIP Welt gerufenen TDM Teilnehmer, dass die in der TDM Welt verwendeten ISUP-Nachrichten wie beispielsweise die ISUP- Nachricht IAM (Initial Address Message) , erzeugt und diesem zugeführt werden muss.The connection between two or more SIP subscribers is established with the help of SIP protocol elements. Among other things, SDP (Session Desing Protocol) data is exchanged. SDP data is bearer-endpoint-related data that contains information about codecs, IP port, IP address, and so on. If a connection is to be established between a SIP subscriber and an H.323 or TDM / ISDN subscriber, these SIP protocol elements must be converted in the participating media gateway controllers according to H.323, TDM or ISDN protocol elements , For example, for a TDM subscriber called from the SIP world, this means that the ISUP messages used in the TDM world, such as the ISUP message IAM (Initial Address Message), must be generated and supplied to the latter.
Im Falle des Leistungsmerkmals "SIP Call-Transfer", wo eine zwischen einem SIP-Teilnehmer (der auch ein TDM Teilnehmer mit einem Übergang zum SIP Netz sein kann) und einem weiteren SIP-Teilnehmer bestehende Verbindung auf einen dritten Teilnehmer (der ein TDM Teilnehmer sein kann) umgeleitet wird, wird in der in der ITU-T Recommendation Q.1912.5 in Kapitel 6.1.1 (1) (a) folgende Empfehlung zum Empfang einer initial INVITE ohne SDP hierzu abgegeben:In the case of the feature "SIP call transfer", where one between a SIP subscriber (who may also be a TDM subscriber with a transition to the SIP network) and another SIP subscriber connection to a third party (the one TDM subscriber can be redirected) is given in ITU-T Recommendation Q.1912.5 in chapter 6.1.1 (1) (a) following the recommendation to receive an initial INVITE without SDP:
,,If SIP preconditions are not in use, the I-IWU shall send the IAM upon receipt of the SDP answer with media descrip- tion.""If SIP preconditions are not in use, the I-IWU should send the IAM upon receipt of the SDP answer with media descrip- tion."
Dies bedeutet, dass in dem Falle, wo die SIP Vorbedingungen nicht aktiviert sind, der Media Gateway Controller (I-IWU) die ISUP-Nachricht IAM erst dann dem gerufenen (dritten) Teilnehmer zuführt, wenn er die SDP-Daten erhalten hat.This means that in the case where the SIP preconditions are not activated, the Media Gateway Controller (I-IWU) the ISUP message IAM only then the called (third) participant supplies when he has received the SDP data.
Diese Vorgehensweise hat jedoch entscheidende Nachteile. So muss der Media Gateway Controller auf der ISUP Seite dieHowever, this approach has significant disadvantages. So the Media Gateway Controller on the ISUP side has the
ISUP-Nachricht IAM speichern, was zusätzlichen Speicherplatz im Media Gateway Controller erfordert. Zum anderen muss die ISUP-Nachricht IAM solange zurückhalten werden, bis von der SIP-Seite die SDP Antwort (Answer) gekommen ist. Dies bedeu- tet jedoch eine weitere RufVerzögerung. Diese Problematik war in den herkömmlichen PSTN Netzen bislang nicht existent.Storing IUP ISUP message, which requires extra space in the Media Gateway Controller. On the other hand, the ISUP message IAM must withhold until the SDP response (Answer) has come from the SIP side. However, this means another call delay. This problem has not existed in the conventional PSTN networks so far.
Der Erfindung liegt die Aufgabe zugrunde, einen Weg aufzuzeigen, wie das Leistungsmerkmal „SIP-Call-Transfer" effizient realisiert werden kann.The invention has for its object to show a way how the feature "SIP call transfer" can be efficiently implemented.
Die Erfindung wird ausgehend von den in den Oberbegriffen der Patentansprüche 1 und 4 angegebenen Merkmale durch die in den kennzeichnenden Teilen beanspruchten Merkmale gelöst.The invention is achieved on the basis of the features specified in the preambles of claims 1 and 4 by the features claimed in the characterizing parts features.
Der Vorteil der Erfindung ist darin zu sehen, dass unter Zuhilfenahme des ISUP Protokollelementes „Continuity on previ- ous circuit" die ISUP-Nachricht IAM früher an den (dritten) Teilnehmer gesendet wird. Mit der vorgeschlagenen Lösung wird damit erreicht, dass der erforderliche Speicherplatz erheblich verringert, der Rufaufbau schneller durchgeführt wird und gleichzeitig der Teilnehmer erst dann gerufen wird, wenn die IP-Bearerverbindung aufgebaut ist. Letzteres ist im Hinblick auf die Sicherheit dieser Verbindung von großer Bedeu- tung.The advantage of the invention can be seen in the fact that the ISUP message IAM is sent earlier to the (third) subscriber with the aid of the ISUP protocol element "continuity on prevision circuit." The proposed solution thus achieves the required memory space the call is set up faster and at the same time the subscriber is not called until the IP bearer connection has been established, the latter being of great importance with regard to the security of this connection.
Die Erfindung wird im Folgenden anhand eines figürlich dargestellten Ausführungsbeispiels näher erläutert. Es zeigen :The invention will be explained in more detail below with reference to a figuratively illustrated embodiment. Show it :
Figur 1 die grundsätzlichen Verhältnisse zwischen 2 PSTN-FIG. 1 shows the basic relationships between 2 PSTN
Teilnehmern, zwischen denen ein Internetnetz ange- ordnet ist,Subscribers between whom an Internet network is located,
Figur 2 die Erfindung am Beispiel des Leistungsmerkmals „SIP CaIl Transfer",2 shows the invention using the example of the feature "SIP Call Transfer",
In Fig. 1 ist eine Netzkonfiguration aufgezeigt, auf der das erfindungsgemäße Verfahren zum Ablauf gelangt. Hierbei sind beispielhaft 2 PSTN-Netze offenbart, in denen jeweils eine Mehrzahl von PSTN-Teilnehmern in bekannter Weise angeordnet sind. Diese sind an Ortsvermittlungsstellen LE herangeführt, die ihrerseits mit Transit-Vermittlungsstellen TX verbunden sind.In Fig. 1, a network configuration is shown, on which the inventive method comes to drain. Here, by way of example, two PSTN networks are disclosed, in each of which a plurality of PSTN subscribers are arranged in a known manner. These are brought to local exchanges LE, which in turn are connected to transit exchanges TX.
In den Transit-Vermittlungsstellen TX wird nun die Trennung zwischen Signalisierungsinformationen und Nutzinformationen durchgeführt. Die Signalisierungsinformationen werden von der Transit-Vermittlungsstelle TX unmittelbar über ein ISUP- Protokoll einem jeweils zugeordneten Media Gateway Controller MGC (MGC A oder MGC B) zugeführt. Die Nutzinformationen werden zu einem (eingangsseitig angeordneten) Media Gateway MG (MG A oder MG B) übertragen, das als Schnittstelle zwischen TDM-Netz und einem ATM- bzw. IP- Übertragungsnetz fungiert und werden über das betreffende Übertragungsnetz paketorientiert übertragen. Das Media Gateway MG A wird von dem Media Gateway Controller MGC A ebenso gesteuert, wie das Media Ga- teway MG B vom Media Gateway Controller MGC B. Im Falle einer Übertragung der Nutzinformationen vom Media Gateway MG A zum Media Gateway MG B werden die Nutzinformationen wieder unter Steuerung des dem Media Gateway MG B zugeordneten Media Gateway Controllers MGC B in einen TDM Datenstrom umgewandelt und dem in Frage kommenden PSTN-Teilnehmer zugeführt werden. Die zwischen dem Media Gateway Controller MGC und dem jeweils zugeordneten Media Gateway übertragenen Daten werden von einem standardisierten Protokoll unterstützt. Dieses kann beispielsweise das MGCP oder das H.248 Protokoll sein. Zwischen den beiden Media Gateway Controllern MGC A, MGC B wird vorzugsweise gemäß vorliegendem Ausführungsbeispiel das SIP Pro- tokoll verwendet. In den Signalisierungspfad können noch weitere Einrichtungen wie SIP-Proxies oder SIP Einheiten SIP E geschaltet sein.In the transit exchanges TX, the separation between signaling information and payload information is now performed. The signaling information is supplied from the transit exchange TX directly via an ISUP protocol to a respectively assigned media gateway controller MGC (MGC A or MGC B). The payload information is transmitted to a (on the input side) arranged Media Gateway MG (MG A or MG B), which acts as an interface between the TDM network and an ATM or IP transmission network and are transmitted packet-oriented over the relevant transmission network. The media gateway MG A is controlled by the media gateway controller MGC A as well as the media gateway MG B by the media gateway controller MGC B. In the case of transmission of the payload from the media gateway MG A to the media gateway MG B, the payload information again under the control of the media gateway MG B assigned Media Gateway Controller MGC B are converted into a TDM data stream and fed to the candidate PSTN participants. The data transmitted between the media gateway controller MGC and the respectively assigned media gateway is provided by a standardized protocol supported. This can be, for example, the MGCP or the H.248 protocol. Between the two media gateway controllers MGC A, MGC B, the SIP protocol is preferably used according to the present embodiment. In the signaling path, other devices such as SIP proxies or SIP units SIP E can be switched.
In Fig. 2 ist eine Konfiguration aufgezeigt, auf der SIP- Call-Transfer Scenarien ablaufen. Demgemäss sind SIP-FIG. 2 shows a configuration in which SIP call transfer scenarios take place. Accordingly, SIP
Teilnehmer A, B aufgezeigt, die miteinander kommunizieren. SIP-Teilnehmer B möchte nun die Kommunikation mit SIP- Teilnehmer A beenden und SIP-Teilnehmer A mit Teilnehmer C verbinden (Call-Transfer) . Zu beachten ist hierbei, dass letzterer - gemäß vorliegendem Ausführungsbeispiel) - in einem klassischen TDM Netz angeordnet ist. SIP Teilnehmer B ü- bergibt nun die für das Leistungsmerkmal „Call-Transfer" (without Consultation) erforderliche Information einem Application Server AS in Form eines SIP Protokollelementes „SIP: REFER to C". Der Application Server AS sendet nun dasParticipants A, B are shown who communicate with each other. SIP subscriber B now wants to terminate the communication with SIP subscriber A and connect SIP subscriber A with subscriber C (call transfer). It should be noted that the latter - according to the present embodiment) - is arranged in a classic TDM network. SIP subscriber B now submits the information required for the feature "call transfer" (without consultation) to an application server AS in the form of a SIP protocol element "SIP: REFER to C". The Application Server AS now sends the
SIP Protokollelement „Initial INVITE ohne SDP Offer" in Richtung Teilnehmer C. Endpunkt ist selbstverständlich ein SIP Endpunkt, also in diesem Fall der Media Gateway Controller MGC.SIP protocol element "Initial INVITE without SDP Offer" in the direction of subscriber C. Endpoint is, of course, a SIP end point, in this case the media gateway controller MGC.
In nachfolgender Tabelle sind die SIP Protokollelemente, die zur Realisierung des Leistungsmerkmals SIP Call-Transfer erforderlich sind, aufgezeigt. Nachdem der Application Server AS der A-Seite von Teilnehmer B die Information erhalten hat, dass ein Call-Tranfer von Teilnehmer A zu Teilnehmer C gewünscht ist, sendet er dem Media Gateway Controller MGC (SIP Endpunkt der C-Seite) das SIP Protokollelement „INVITE ohne SDP Daten".The table below shows the SIP protocol elements required to implement the SIP Call Transfer feature. After the application server AS of the A-side of subscriber B has received the information that a call transfer from subscriber A to subscriber C is desired, he sends the media gateway controller MGC (SIP end-point of the C-side) the SIP protocol element " INVITE without SDP data ".
Der Media Gateway Controller MGC kontaktiert hieraufhin zum einen das zugehörige Media Gateway MG, übernimmt von dort die SDP-Daten und quittiert der A-Seite mit dem SIP Protokollele- ment „Provisional Response" die SDP-Daten des Teilnehmers C vom stellvertretenden Media Gateway MG. Zum anderen übergibt der Media Gateway Controller MGC erfindungsgemäss der nächsten ISUP Vermittlungsstelle in Richtung Teilnehmer C eine IAM Nachricht mit dem ISUP Protokollelement „Continuity on previ- ous circuit". Bei diesem ISUP Protokollelement handelt es sich um eine Nachricht, die üblicherweise für die Durchgangsprüfung zum Endteilnehmer verwendet wird. Sie führt dazu, dass beim Teilnehmer C noch kein Klingelton initiiert wird, dieser also noch nicht gerufen wird.The media gateway controller MGC then contacts the associated media gateway MG, takes over the SDP data from there and acknowledges the A-side with the SIP protocol element. "Provisional Response" the SDP data of the subscriber C from the deputy media gateway MG On the other hand, the media gateway controller MGC transfers according to the invention the next ISUP switching center in the direction of the subscriber C an IAM message with the ISUP protocol element "Continuity on prevision circuit" , This ISUP protocol element is a message that is commonly used for the end-user continuity check. It leads to the fact that at the participant C still no ringtone is initiated, thus this is not yet called.
Tabelle table
Die A-Seite quittiert den Erhalt der „Provisional Response" mit Hilfe der PRACK Methode mit den SDP-Daten der A-Seite (also des A-Teilnehmers) dem Media Gateway Controller MGC. Gleichzeitig wird die Bearerverbindung zwischen dem Endpunkt von Teilnehmer A und Teilnehmer C aufgebaut. Der Media Gateway Controller MGC übergibt nun das ISUP Protokollelement „Continuity (COT)" und lässt Teilnehmer C rufen. Der Ab- Schluss des Verbindungsaufbaus erfolgt nun gemäß Standard durch den Austausch der SIP Protokollelement 200 OK, ACM (Address Compete Message) und ANM.The A-side acknowledges receipt of the "Provisional Response" using the PRACK method with the SDP data of the A-side (ie the A-subscriber) of the Media Gateway Controller MGC, at the same time the bearer connection between the end-point of subscriber A and Subscriber C. The media gateway controller MGC now hands over the ISUP protocol element "continuity (COT)" and has subscriber C called. The termination of the connection establishment now takes place in accordance with the standard by exchanging the SIP protocol element 200 OK, ACM (Address Compete Message) and ANM.
Entsprechend würde in der ITU-T Recommendation Q.1912.5 in Kapitel 6.1.1 (1) (a) folgende Ergänzung erfindungsgemäß erforderlich sein:Accordingly, in ITU-T Recommendation Q.1912.5 in Chapter 6.1.1 (1) (a), the following supplement would be required according to the invention:
If SIP preconditions are not in use, the I-IWU shall send the IAM with the indication „continuity check on previus circuit" and shall send upon receipt of the SDP answer with media de- scription the COT message.If SIP preconditions are not in use, the I-IWU should send the IAM with the indication "continuity check on previus circuit" and will send upon receipt of the SDP answer with media description the COT message.
Es ist zu beachten, dass die Erfindung auch angewendet werden kann, wenn es keinen ISUP/ SIP zwischen dem PSTN Teilnehmer (ISDN, Analoger Teilnehmer oder auch Mobilfunk Teilnehmer) und dem SIP bzw. SIP-T Teilnehmer gibt. Dies bedeutet, dass das oben genannte Verfahren dann innerhalb der Vermittlungsstelle stattfindet . Das Interworking von NextGenerationNetwork Teilnehmern wie VoDSL, H323 etc. zu SIP bzw. SIP-T wird damit ebenfalls möglich.It should be noted that the invention can also be applied if there is no ISUP / SIP between the PSTN subscriber (ISDN, analog subscriber or mobile subscriber) and the SIP or SIP-T subscriber. This means that the above procedure then takes place within the central office. The interworking of NextGenerationNetwork subscribers such as VoDSL, H323 etc. to SIP or SIP-T is also possible.
Schliesslich wurde die Erfindung am Beispiel des Leistungsmerkmals „SIP CaIl Transfer" aufgezeigt. Auch dies soll keine Einschränkung bedeuten. Szenarien, wie sie beispielsweise im RFC3725 Kapitel 4.1 und 4.3 angesprochen sind („Best Current Practices for Third Party CaIl Control (3pcc) in the Session Initiation Protocol (SIP)") können mit der Erfindung ebenfalls behandelt werden.Finally, the invention was demonstrated using the example of the "SIP Call Transfer" feature, which is not intended to be restrictive Scenarios, such as those mentioned in RFC3725 Chapters 4.1 and 4.3 ("Best Current Practices for Third Party Call Control (3pcc) in the session Initiation Protocol (SIP) ") can also be treated with the invention.
Ferner wurde gemäß vorliegendem Ausführungsbeispiel die An- Wendung des ISUP mit IAM und COT beschrieben. Die Erfindung ist nicht darauf beschränkt, da es natürlich auch ein direktes interworking von SIP auf DSSl oder TUP etc. geben kann, wo kein ISUP beim C-Teilnehmer existieren würde. Die beschriebenen Mechanismen können dort aber auch in allgemeiner Form angewendet werden. So könnte z. B. eine Sinalisierung- sart ungleich ISUP, welche die "IAM with continuity on this/ on previuos circuit " nicht hat, die letzte gewählte Ziffer einfach noch nicht senden, so dass der Teilnehemr noch nicht gerufen werden kann. Erst wenn das SDP answer gekommen ist, würde z.B. dann diese Ziffer in der Signaliserung (SAM: Subsequent address message in ISUP Sprache) nachgereicht würde. Erst mit dieser letzten gewählten Ziffer kann dann das Zielamt den tatsächlichen Teilnehmer auswählen/ erreichen, womit erst jetzt auch erst geklingelt würde. Further, according to the present embodiment, the application of the ISUP with IAM and COT has been described. The invention is not limited to this, as there may of course also be a direct interworking of SIP on DSSl or TUP etc., where no ISUP would exist on the C-subscriber. However, the described mechanisms can also be used there in a general form. So z. For example, a sinalization type not equal to ISUP, which does not have the "IAM with continuity on this / on previuos circuit", simply does not yet send the last dialed digit so that the subscriber can not yet be called. Only when the SDP has come answer would e.g. then this number in the signaling (SAM: Subsequent address message in ISUP language) would be submitted later. Only with this last selected digit can the target office then select / reach the actual participant, which only now would ring.

Claims

Patentansprüche claims
1. Verfahren zum Steuern von Kommunikationsbeziehungen zwischen wenigstens 2 Endpunkten (A, B, C) , deren (Bearer-) end- punktbezogene Daten durch SDP Daten charakterisiert sind, dadurch gekennzeichnet, dass das SIP Protokollelement INITIAL INVITE ohne SDP Daten dem gerufenen Endpunkt (C) zugeführt wird, welcher den Erhalt mit dem SIP Protokollelement PROVISIONAL RESPONSE mit seinen SDP Daten (SDP Offer) dem rufenden Endpunkt (A, B) quittiert, dass unter Zuhilfenahme des ISUP Protokollelementes CONTINUITY CHECK ON THIS OR ON PREVIOUS CIRCUIT ein erstes Informationselement die Zielvermittlungsstelle über den Verbindungswunsch unterrichtet, dass der rufende Endpunkt (A, B) daraufhin in dem SIP Protokollelement PRACK seine SDP Daten (SDP Answer) dem gerufenen Endpunkt (C) übergibt, welches zum Rufen des Teilnehmers führt, indem dies in ein zweites Protokollelement umgesetzt wird, woraufhin der gerufene Endpunkt (C) angeläutet wird.1. A method for controlling communication relationships between at least two endpoints (A, B, C) whose (bearer) endpoint-related data are characterized by SDP data, characterized in that the SIP protocol element INITIAL INVITE without SDP data belongs to the called endpoint ( C), which acknowledges the receipt with the SIP protocol element PROVISIONAL RESPONSE with its SDP data (SDP offer) to the calling end point (A, B), that with the aid of the ISUP protocol element CONTINUITY CHECK ON THIS OR ON PREVIOUS CIRCUIT a first information element Target exchange informed about the connection request that the calling endpoint (A, B) then in the SIP protocol element PRACK its SDP data (SDP Answer) the called endpoint (C) passes, which leads to the call of the subscriber, by converting this into a second protocol element then the called end point (C) is rung.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das erste Informationselement die ISUP-Nachricht IAM ist .2. The method according to claim 1, characterized in that the first information element is the ISUP message IAM.
3. Verfahren nach Anspruch 1 , 2, dadurch gekennzeichnet, dass das zweite Informationselement das ISUP Protokollelement COT (Continuity) ist.3. The method of claim 1, 2, characterized in that the second information element is the ISUP protocol element COT (continuity).
4. Vorrichtung zum Steuern von Kommunikationsbeziehungen zwischen wenigstens 2 Endpunkten (A, B, C) , deren (Bearer-) endpunktbezogene Daten durch SDP Daten charakterisiert sind, dadurch gekennzeichnet, dass Mittel vorgesehen sind, die das SIP Protokollelement4. A device for controlling communication relationships between at least two endpoints (A, B, C) whose (bearer) endpoint-related data are characterized by SDP data, characterized in that means are provided which comprise the SIP protocol element
INITIAL INVITE ohne SDP Daten dem gerufenen Endpunkt (C) zuführen, welcher den Erhalt mit dem SIP Protokollelement PROVISIONAL RESPONSE mit seinen SDP Daten (SDP Offer) dem rufenden Endpunkt (A, B) quittiert, dass weitere Mittel vorgesehen sind, über die unter Zuhilfenahme des ISUP Protokollelementes CONTINUITY CHECK ON THIS OR ON PREVIOUS CIRCUIT ein erstes Informationselement die Zielvermittlungsstelle über den Verbindungswunsch unterrichtet, und der rufende Endpunkt (A, B) daraufhin in dem SIP Protokollelement PRACK seine SDP Daten (SDP Answer) dem gerufenen Endpunkt (C) übergibt, was zum Rufen des Teilnehmers führt, indem dies in ein zweites Protokollelement umgesetzt wird, woraufhin der gerufene Endpunkt (C) angeläutet wird.INITIAL INVITE without SDP supply data to the called endpoint (C), which is the receipt with the SIP protocol element PROVISIONAL RESPONSE with its SDP data (SDP Offer) acknowledges the calling endpoint (A, B) that further means are provided, via which, with the aid of the ISUP protocol element CONTINUITY CHECK ON THIS OR ON PREVIOUS CIRCUIT, a first information element informs the destination switching center about the connection request , and the calling endpoint (A, B) then in the SIP protocol element PRACK hands over its SDP data (SDP Answer) to the called endpoint (C), resulting in the calling of the subscriber by translating this into a second protocol element, whereupon the called one End point (C) is rung.
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Endgerät als PSTN Endgerät ausgebildet ist.5. Apparatus according to claim 4, characterized in that the terminal is designed as a PSTN terminal.
6. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Endgerät als SIP Endgerät ausgebildet ist.6. Apparatus according to claim 4, characterized in that the terminal is designed as a SIP terminal.
7. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das Endgerät als Automat oder Adressbuch ausgebildet ist .7. The device according to claim 4, characterized in that the terminal is designed as a vending machine or address book.
8. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das erste Informationselement als ISUP-Nachricht IAM ausgebildet ist.8. The device according to claim 4, characterized in that the first information element is designed as ISUP message IAM.
9. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das zweite Informationselement als ISUP Protokollelement COT (Continuity) ausgebildet ist. 9. Device according to claim 4, characterized in that the second information element is designed as an ISUP protocol element COT (continuity).
EP06763464A 2005-06-13 2006-06-01 Method for controlling the user facility "sip call-transfer" Withdrawn EP1897321A1 (en)

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