EP1897321A1 - Procede pour commander la fonction "transfert d'appel sip" - Google Patents

Procede pour commander la fonction "transfert d'appel sip"

Info

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Withdrawn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)
English (en)
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/fr
Withdrawn legal-status Critical Current

Links

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

Landscapes

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

Abstract

Dans l'art antérieur, selon la recommandation Q.1912.5 de l'ITU-T, dans le chapitre 6.1.1 (1)(a), pour mettre en oeuvre la fonction 'transfert d'appel IP', si les préconditions SIP ne sont pas activées, le contrôleur de passerelle média (I-IWU) envoie le message ISUP IAM uniquement à un (troisième) abonné appelé, lorsque celui-ci a reçu les données SDP. Néanmoins, cette procédure présente des inconvénients déterminants en termes de besoins de mémoire supplémentaire dans le contrôleur de passerelle média, et entraîne des retards d'appel. La présente invention permet de résoudre ce problème. Selon l'invention, le message IAM et l'élément de protocole ISUP 'vérification de continuité du circuit précédent' sont transmis à l'abonné ISUP, et la connexion de support est établie uniquement une fois les données SDP du côté A reçues.
EP06763464A 2005-06-13 2006-06-01 Procede pour commander la fonction "transfert d'appel sip" Withdrawn EP1897321A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005027231 2005-06-13
PCT/EP2006/062843 WO2006134034A1 (fr) 2005-06-13 2006-06-01 Procede pour commander la fonction 'transfert d'appel sip'

Publications (1)

Publication Number Publication Date
EP1897321A1 true EP1897321A1 (fr) 2008-03-12

Family

ID=36940405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06763464A Withdrawn EP1897321A1 (fr) 2005-06-13 2006-06-01 Procede pour commander la fonction "transfert d'appel sip"

Country Status (4)

Country Link
EP (1) EP1897321A1 (fr)
JP (1) JP2008544597A (fr)
CN (1) CN101248641A (fr)
WO (1) WO2006134034A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101217601B (zh) * 2007-01-05 2012-09-05 中兴通讯股份有限公司 盲转业务方法和装置
CN101217600A (zh) * 2007-01-05 2008-07-09 中兴通讯股份有限公司 询问转接业务方法和装置
CN101330647B (zh) * 2007-09-21 2011-10-26 中兴通讯股份有限公司 会话描述协议媒体修改方法
CN101471921B (zh) * 2007-12-25 2012-04-04 华为技术有限公司 一种bicc与sip之间互通的方法和设备
WO2009074078A1 (fr) * 2007-12-04 2009-06-18 Huawei Technologies Co., Ltd. Procédé et dispositif d'interfonctionnement entre bicc et sip
CN101567797B (zh) * 2009-05-20 2013-02-27 中兴通讯股份有限公司 一种实现转移类业务的方法及系统
CN102238500B (zh) * 2010-04-21 2014-07-02 中兴通讯股份有限公司 一种实现安全呼叫转移的方法及系统

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1507395A1 (fr) * 2003-08-14 2005-02-16 Siemens Aktiengesellschaft Procédé pour l'établissement de renvoi d'appels pour un poste téléphonique SIP par un client SIP dans un réseau mixte à commutation de circuit et un à commutation de paquet

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006134034A1 *

Also Published As

Publication number Publication date
WO2006134034A1 (fr) 2006-12-21
JP2008544597A (ja) 2008-12-04
CN101248641A (zh) 2008-08-20

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