WO2007065738A1 - Device and method for supporting fax t.38 applications in fmc networks - Google Patents

Device and method for supporting fax t.38 applications in fmc networks Download PDF

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Publication number
WO2007065738A1
WO2007065738A1 PCT/EP2006/065623 EP2006065623W WO2007065738A1 WO 2007065738 A1 WO2007065738 A1 WO 2007065738A1 EP 2006065623 W EP2006065623 W EP 2006065623W WO 2007065738 A1 WO2007065738 A1 WO 2007065738A1
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Prior art keywords
date
fax
applications
networks
sdp
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PCT/EP2006/065623
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German (de)
French (fr)
Inventor
Klaus Hoffmann
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Nokia Siemens Networks Gmbh & Co. Kg
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Publication of WO2007065738A1 publication Critical patent/WO2007065738A1/en

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    • 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
    • H04L65/102—Gateways
    • H04L65/1033—Signalling gateways
    • H04L65/104—Signalling gateways in the network
    • 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
    • H04L65/102—Gateways
    • H04L65/1023—Media gateways
    • H04L65/103—Media gateways in the network
    • 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
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/04—Protocols specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00127—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture
    • H04N1/00204—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture with a digital computer or a digital computer system, e.g. an internet server
    • H04N1/00209—Transmitting or receiving image data, e.g. facsimile data, via a computer, e.g. using e-mail, a computer network, the internet, I-fax
    • H04N1/00214—Transmitting or receiving image data, e.g. facsimile data, via a computer, e.g. using e-mail, a computer network, the internet, I-fax details of transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00127—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture
    • H04N1/00204—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture with a digital computer or a digital computer system, e.g. an internet server
    • H04N1/00209—Transmitting or receiving image data, e.g. facsimile data, via a computer, e.g. using e-mail, a computer network, the internet, I-fax
    • H04N1/00214—Transmitting or receiving image data, e.g. facsimile data, via a computer, e.g. using e-mail, a computer network, the internet, I-fax details of transmission
    • H04N1/0022—Transmitting or receiving image data, e.g. facsimile data, via a computer, e.g. using e-mail, a computer network, the internet, I-fax details of transmission involving facsimile protocols or a combination of facsimile protocols and computer data transmission protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00127—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture
    • H04N1/00281—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture with a telecommunication apparatus, e.g. a switched network of teleprinters for the distribution of text-based information, a selective call terminal
    • H04N1/00307—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture with a telecommunication apparatus, e.g. a switched network of teleprinters for the distribution of text-based information, a selective call terminal with a mobile telephone apparatus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/00127—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture
    • H04N1/00281—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture with a telecommunication apparatus, e.g. a switched network of teleprinters for the distribution of text-based information, a selective call terminal
    • H04N1/00312—Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture with a telecommunication apparatus, e.g. a switched network of teleprinters for the distribution of text-based information, a selective call terminal with a digital transmission apparatus, e.g. a switched network of teleprinters for the distribution of text-based information, SMS or ISDN device
    • 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
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/10—Aspects of automatic or semi-automatic exchanges related to the purpose or context of the telephonic communication
    • H04M2203/1091—Fixed mobile conversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/65—Aspects of automatic or semi-automatic exchanges related to applications where calls are combined with other types of communication
    • H04M2203/657—Combination of voice and fax calls
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/0008—Connection or combination of a still picture apparatus with another apparatus
    • H04N2201/0015—Control of image communication with the connected apparatus, e.g. signalling capability
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/0008—Connection or combination of a still picture apparatus with another apparatus
    • H04N2201/0015—Control of image communication with the connected apparatus, e.g. signalling capability
    • H04N2201/0024—Converting image communication control signals, e.g. group 3 facsimile protocol signals, to non-image communication control signals or vice versa
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/0077—Types of the still picture apparatus
    • H04N2201/0091—Digital copier; digital 'photocopier'

Definitions

  • More recent communication architectures provide for the separation of switching networks into connection service-related units and the transport of user information (bearer control). This results in a decomposition / separation of connection establishment and medium or bearer establishment.
  • the transmission of the user information (switching through the user channel) can be carried out using different high-bit-rate transport technologies such as ATM, IP or Frame Relay can be made.
  • the telecommunication services currently carried out in narrowband networks can also be implemented in broadband networks.
  • the participants are connected either directly (eg via a DSSl protocol) or via switching centers designed as a media gateway controller (MGC) (eg via the ISUP protocol).
  • MSC media gateway controller
  • the user information itself is converted by media gateways (MG) into the transport technology used.
  • the media gateways are controlled by assigned media gateway controllers (MGC).
  • MCC media gateway controllers
  • the media gateway controllers use standardized protocols such as B. the MGCP protocol or the H.248 protocol.
  • BICC Breast Independent Call Control
  • the media gateway controllers use a BICC (Bearer Independent Call Control) protocol standardized by the ITU, which is formed from a number of standardized protocols and thus comprises a protocol family.
  • a protocol that is adequate for the BICC protocol has been developed by the IETF standardization body with the SIP protocol (RFC3261) or the addition SIP-T (RFC3204) / SIP-I. With the latter, ISUP messages - in contrast to the SIP protocol - be transmitted. ISUP messages are generally transmitted through tunnels, ie through transparent transmission. The connection between two or more SIP participants is established with the help of SIP protocol elements. Among other things, SDP (Session Description Protocol) data is exchanged. SDP data is (bearer) end point-related data that contains information about the end devices or codecs, IP port, IP address etc. 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 implemented accordingly in the media gateway controllers involved in H.323, TDM or ISDN protocol elements .
  • SDP Session Description Protocol
  • the ITU-T Q.1912.5 recommendation basically specifies the conditions as they arise between SIP and PSTN participants. No distinction is made between line-bound and mobile subscribers. However, non-mobile subscribers are also used for FMC networks (fixed mobile conversion, i.e. mixed mobile fixed networks). This will result in interworking of all networked units in such FMC networks with different units such as clients and gateway units (MGCF, MGC etc.).
  • FMC networks fixed mobile conversion, i.e. mixed mobile fixed networks.
  • the ITU-T recommendation Q1912.5 supports FAX T.38 applications. With increasing use of SIP clients, too can run on PDAs / cellphones that can be used in the context of 3GPP, there is also a need to perform the FAX service via T.38 (ITU-T recommendation T.38). However, this service is not possible in 3GPP because the IMS architecture FAX T.38 does not support applications.
  • the SDP data are tapped and fed to the PDF function (Policy Decision Function) via the Gq interface. It then decides whether the bearer can be released between the two end devices according to the existing SDP data. Since the device P-CSCF for a T. 38 Endgerat representative SDP date "IMAGE" not preserving or knows, this facility will face over the assigned Gq Inter- therefore not in accordance Adjustab ⁇ len also Baerer. Since the SDP data is currently only tapped when exchanging between the two terminals, it is exchanged unchanged between the terminals via SIP signaling, so the SIP signaling does not notice any problems and, if necessary, the charging begins. However, since the PDF function did not activate the bearer, the user cannot make a FAX T.38 transmission, but is charged for. The invention has for its object to show a way how FAX T.38 applications can be implemented in FMC networks.
  • Policy Decision Function Policy Decision Function
  • Figure 1 shows the basic relationships between PSTN and / or mobile subscribers, between which one
  • Internet network is arranged
  • FIG. 2 shows the concrete design of an FMC network
  • FIG. 3 the IM subsystem according to standard TS24.229, 1 shows the basic relationships between PSTN and / or mobile subscribers, between whom an Internet network is arranged.
  • PSTN networks are disclosed here by way of example, in each of which a plurality of PSTN subscribers are connected in a known manner. These are brought up to local exchanges LE, which in turn are connected to transit exchanges TX. In the transit exchanges TX, the separation between signaling information and useful information is now carried out.
  • the signaling information is supplied by the transit exchange TX directly to an associated media gateway controller MGC (MGC A or MGC B) via an ISUP protocol.
  • MGC media gateway controller
  • the user information is transmitted to a 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 is transmitted in a packet-oriented manner via the transmission network in question.
  • the media gateway MG A is controlled by the media gateway controller MGC A in the same way as the media gateway MG B by the media gateway controller MGC B.
  • the useful information is again under Control of the media gateway controller MGC B assigned to the media gateway MG B is converted into a TDM data stream and fed to the PSTN subscriber in question.
  • the data transmitted between the media gateway controller MGC and the respectively assigned media gateway are supported by a standardized protocol.
  • the SIP protocol is preferably used between the two media gateway controllers MGC A, MGC B.
  • an IMS subsystem with facilities P-CSCF, PDF is introduced at the Media Gateway Controller MGC B.
  • the PSTN participants can be connected. Basically it is about 1 already has an FMC network in its simplest form.
  • FIG. 2 shows an FMC network with a plurality of structures. Accordingly, a plurality of meshed networks can be removed.
  • Networks IM subsystems IMS or domains are arranged as transition points.
  • BGCF Bandout gateway control function
  • facilities CSCF, P-CSCF and other facilities are shown, the interaction of which is also explained in the above standard.
  • the BGCF function breakout gateway control function selects the network (domain, e.g. PSTN) into which the call originating from a SIP terminal UE is to be routed. If the BGCF function determines that the destination is in its own network, i. H. in the network in which the BGCF function is arranged, the BGCF function selects an MGCF functionality that is responsible for interworking with the PSTN network. If the destination is in another network, the BGCF function passes the signaling on to the other network.
  • FIG. 3 shows the device P-CSCF, which functions as control of the interface Gq.
  • a function PDF Policy Description Function
  • FIG. 3 specifies the rules in the network. If, for example, 2 terminal devices exchange SDP data, these are picked up by the P-CSCF device and supplied to the PDF function. If the latter determines that the specified rules have been violated, the bearer is not released and both participants cannot communicate with one another as planned.
  • the interface Gq is extended by the SDP date “IMAGE”. Furthermore, the SDP date “IMAGE” is to be integrated into the function PDF of the device P-CSCF.
  • the tapped SDP data have the following structure in the Media Line field, for example:

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • General Engineering & Computer Science (AREA)
  • Computing Systems (AREA)
  • Human Computer Interaction (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Telephonic Communication Services (AREA)

Abstract

According to prior art, T.38 fax applications are defined for fixed networks. There is no comparable definition for mobile networks. The problem is therefore that in mixed FMC networks (fixed mobile conversion, i.e. mixed mobile networks) with an interworking of all networked units, T.38 fax applications between the fixed network and a mobile subscriber are not supported. The invention is characterized in that the value range of the interface (Gq) of the subsystem (IM) is extended by the SDP date IMAGE , thereby making it possible to recognize a T.38 fax application when IMAGE is received, and IMAGE is handed over to the policy function PDF. The latter controls the bearer correspondingly, allowing both subscribers to communicate via T.38 fax.

Description

Beschreibung description
Vorrichtung und Verfahren zur Unterstützung von Fax T.38 Anwendungen in FMC Netzen. Device and method for supporting fax T.38 applications in FMC networks.
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. More recent communication architectures provide for the separation of switching networks into connection service-related units and the transport of user information (bearer control). This results in a decomposition / separation of connection establishment and medium or bearer establishment. The transmission of the user information (switching through the user channel) can be carried out using different high-bit-rate transport technologies such as ATM, IP or Frame Relay can be made.
Mit einer derartigen Trennung sind die gegenwartig 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. 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. Ein dem BICC Protokoll adäquates Protokoll ist bei dem IETF Standardisierungsgremium mit dem SIP Protokoll (RFC3261) bzw. dem Zusatz SIP-T (RFC3204)/ SIP-I entstanden. Mit letzteren können ISUP-Nachrichten - im Gegensatz zum SIP Protokoll - übertragen werden. Die Übertragung der ISUP-Nachrichten erfolgt im allgemeinen durch Tunneln, d. h. durch transparentes Durchreichen . Der Verbindungsaufbau zwischen 2 oder mehreren SIP-Teilneh- mern erfolgt unter Zuhilfenahme von SIP-Protokollelementen . Hierbei werden unter anderem SDP (Session Description Proto- col) Daten ausgetauscht. SDP-Daten sind (Bearer-) endpunktbezogene Daten, die Informationen über die Endgerate oder Co- decs, 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-Protokoll- elemente in den beteiligten Media Gateway Controllern entsprechend in H.323-, TDM- oder ISDN Protokollelemente umge- setzt werden. With such a separation, the telecommunication services currently carried out in narrowband networks can also be implemented in broadband networks. The participants are connected either directly (eg via a DSSl protocol) or via switching centers designed as a media gateway controller (MGC) (eg via the ISUP protocol). The user information itself is converted by media gateways (MG) into the transport technology used. The media gateways are controlled by assigned media gateway controllers (MGC). To control the media gateways, the media gateway controllers use standardized protocols such as B. the MGCP protocol or the H.248 protocol. For communication with one another, the media gateway controllers use a BICC (Bearer Independent Call Control) protocol standardized by the ITU, which is formed from a number of standardized protocols and thus comprises a protocol family. A protocol that is adequate for the BICC protocol has been developed by the IETF standardization body with the SIP protocol (RFC3261) or the addition SIP-T (RFC3204) / SIP-I. With the latter, ISUP messages - in contrast to the SIP protocol - be transmitted. ISUP messages are generally transmitted through tunnels, ie through transparent transmission. The connection between two or more SIP participants is established with the help of SIP protocol elements. Among other things, SDP (Session Description Protocol) data is exchanged. SDP data is (bearer) end point-related data that contains information about the end devices or codecs, IP port, IP address etc. 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 implemented accordingly in the media gateway controllers involved in H.323, TDM or ISDN protocol elements .
Erste grundsatzliche Betrachtungen haben innerhalb der ITU-T zur Draft Recommendation Q.1912.5„Interworking SIP and BICC/ ISUP" gefuhrt. Hierbei wurden auch schon erste Überlegungen bezuglich der aus der ISDN Welt bekannten Supplementary Services vorgenommen. Gleiches gilt für das Standardisierungsgremium 3GPP für mobile Teilnehmer, wo SIP basierte Dienste spezifiziert sind (TS 24.229) . Insbesondere ist hier in der IMS (IP multimedia Subsystem) eine Architektur vorgegeben und standardisiert, wie sie in Fig. 2 aufgezeigt ist. The first fundamental considerations led to the draft recommendation Q.1912.5 "Interworking SIP and BICC / ISUP" within the ITU-T. The first considerations regarding the supplementary services known from the ISDN world have already been made. The same applies to the standardization body 3GPP for mobile Participants where SIP-based services are specified (TS 24.229) In particular, an architecture is specified and standardized here in the IMS (IP multimedia subsystem), as shown in FIG.
Grundsatzlich werden in der ITU-T Q.1912.5 Empfehlung die Verhaltnisse spezifiziert, wie sie sich zwischen SIP- und PSTN-Teilnehmern ergeben. Dabei wird kein Unterschied zwi- sehen leitungsgebundenen und mobilen Teilnehmern gemacht. Für FMC Netze (fixed mobile conversion, d. h. gemischte mobile Festnetze) jedoch kommen auch nicht mobile Teilnehmer zur Anwendung. Damit wird es in derartigen FMC Netzen mit unterschiedlichen Einheiten wie Clients und Netzubergangseinheiten (MGCF, MGC etc.) zu einem Interworking aller miteinander vernetzter Einheiten kommen. The ITU-T Q.1912.5 recommendation basically specifies the conditions as they arise between SIP and PSTN participants. No distinction is made between line-bound and mobile subscribers. However, non-mobile subscribers are also used for FMC networks (fixed mobile conversion, i.e. mixed mobile fixed networks). This will result in interworking of all networked units in such FMC networks with different units such as clients and gateway units (MGCF, MGC etc.).
Die ITU-T Empfehlung Q1912.5 unterstutzt FAX T.38 Anwendungen. Mit zunehmender Verbreitung von SIP Clients, die auch auf PDA' s/ Handy' s laufen können, die im Rahmen von 3GPP anwendbar sind, entsteht auch der Bedarf den FAX Dienst über T.38 (ITU-T recommendation T.38) durchzufuhren. Dieser Dienst ist jedoch im 3GPP nicht möglich, da die IMS Architektur FAX T.38 Anwendungen nicht unterstutzt. Entsprechend der 3GPP Empfehlung TS29.209 V6.2.0 (2005-03) „3rd Generation Partnership Project; Technical Specification Group Core Network; Policy control over Gq interface (Release 6)" sind im Kapitel 6.5.21 lediglich für die SDP Daten "AUDIO (O)", "VIDEO (I)", "DATA (2)", "APPLICATION (3)", und "CONTROL (4)" erlaubt. Für T.38 Anwendungen wird jedoch das SDP Datum „IMAGE" im Media-line (m-line) Feld des SDP Protokolls benutzt. Die hierzu erforderliche Festlegung erfolgt aus der IETF Empfehlung RFC 3362, „G. Parsons, "Realtime Facsimile (T.38) - image_t38 MIME Sub-type Registration", August 2002." und Detaillierung in Rec. T.38 /V152. Nachfolgend ist ein entsprechendes Media-Line Feld beispielhaft im SDP Protokoll aufgezeigt: v=0 The ITU-T recommendation Q1912.5 supports FAX T.38 applications. With increasing use of SIP clients, too can run on PDAs / cellphones that can be used in the context of 3GPP, there is also a need to perform the FAX service via T.38 (ITU-T recommendation T.38). However, this service is not possible in 3GPP because the IMS architecture FAX T.38 does not support applications. According to the 3GPP recommendation TS29.209 V6.2.0 (2005-03) “3rd Generation Partnership Project; Technical Specification Group Core Network; Policy control over Gq interface (Release 6) "are only in chapter 6.5.21 for the SDP data" AUDIO (O) "," VIDEO (I) "," DATA (2) "," APPLICATION (3) ", and "CONTROL (4)" is permitted, but for T.38 applications the SDP date "IMAGE" in the media-line (m-line) field of the SDP protocol is used. The required definition is based on IETF recommendation RFC 3362, "G. Parsons, "Realtime Facsimile (T.38) - image_t38 MIME Sub-type Registration", August 2002. "and detailing in Rec. T.38 / V152. The following is an example of a corresponding media line field in the SDP protocol: v = 0
o=faxgwl 2890844526 2890842807 IN IP4 128.59.19.68  o = faxgwl 2890844526 2890842807 IN IP4 128.59.19.68
e=+l-212-555-1234@bell-tel.com  e=+l-212-555-1234@bell-tel.com
t=2873397496 0  t = 2873397496 0
C=IN I P4 128 . 59 . 19 . 68  C = IN I P4 128. 59. 19th 68
m=image 49170 udptl t38  m = image 49170 udptl t38
a=T38FaxRateManagement : transf erredTCF  a = T38FaxRateManagement: transf erredTCF
a=T38FaxUdpEC : t38UDPFEC  a = T38FaxUdpEC: t38UDPFEC
m=image 49172 tcp t38  m = image 49172 tcp t38
a=T38FaxRateManagement t localTCF  a = T38FaxRateManagement t localTCF
In der Einrichtung P-CSCF der IMS Architektur ( Fig . 2 ) werden die SDP Daten abgegri f fen , und über das Gq Interface der PDF Funktion ( Pol icy Deci s ion Function ) zugeführt . Von dieser wird dann entschieden , ob der Bearer nach Mas sgabe der vorhandenen SDP Daten zwi schen den beiden Endgeraten fre igegeben werden kann . Da die Einrichtung P-CSCF das für ein T . 38 Endgerat repräsentative SDP Datum „IMAGE" nicht erhalt oder kennt , wird diese Einrichtung über das zugeordnete Gq Inter- face demzufolge auch den Baerer nicht entsprechend einstel ¬ len . Da die SDP Daten derzeit lediglich beim Austausch zwischen den beiden Endgeraten abgegriffen werden, werden diese unverändert zwischen den Endgeraten über SIP Signalisierung ausgetauscht, die SIP Signalisierung bemerkt somit keine Probleme und beginnt gegebenenfalls die Vergebuhrung. Da die PDF Funktion den Bearer jedoch nicht freigeschaltet hat, kann der Anwender keine FAX T.38 Übertragung vornehmen, wird aber vergebuhrt . Der Erfindung liegt die Aufgabe zugrunde, einen Weg aufzuzeigen, wie FAX T.38 Anwendungen in FMC-Netzen realisiert werden können . In the device P-CSCF of the IMS architecture (FIG. 2), the SDP data are tapped and fed to the PDF function (Policy Decision Function) via the Gq interface. It then decides whether the bearer can be released between the two end devices according to the existing SDP data. Since the device P-CSCF for a T. 38 Endgerat representative SDP date "IMAGE" not preserving or knows, this facility will face over the assigned Gq Inter- therefore not in accordance Adjustab ¬ len also Baerer. Since the SDP data is currently only tapped when exchanging between the two terminals, it is exchanged unchanged between the terminals via SIP signaling, so the SIP signaling does not notice any problems and, if necessary, the charging begins. However, since the PDF function did not activate the bearer, the user cannot make a FAX T.38 transmission, but is charged for. The invention has for its object to show a way how FAX T.38 applications can be implemented in FMC networks.
Die Erfindung wird ausgehend von den in den Oberbegriffen der Patentanspruchs 1 und 5 angegebenen Merkmale durch die in den kennzeichnenden Teilen beanspruchten Merkmale gelost. The invention is based on the features specified in the preambles of claims 1 and 5 by the features claimed in the characterizing parts.
Der Vorteil der Erfindung ist darin zu sehen, dass der Wertebereich der Schnittstelle Gq des Subsystems IMS um das SDP Datum „IMAGE" erweitert wird. Dadurch wird bei Eintreffen von „IMAGE" eine T.38 Fax Anwendung erkannt und „IMAGE" wird der Policyfunktion (PDF) übergegeben wird. Diese steuert daraufhin den Bearer in entsprechender Weise, beide Teilnehmer können damit über T.38 Fax kommunizieren. Das wichtige Feature FAX CaIl mit T.38, das der Anwender bisher im normalen Nextgeneration (IP Netz) Telefonnetz kennt, kann nun auch in hybriden SIP Festnetzen angeboten werde. The advantage of the invention can be seen in the fact that the value range of the interface Gq of the subsystem IMS is extended by the SDP date “IMAGE”. As a result, when “IMAGE” arrives, a T.38 fax application is recognized and “IMAGE” becomes the policy function (PDF) which then controls the bearer in a corresponding manner so that both participants can communicate via T.38 fax. The important feature FAX Call with T.38, which the user is familiar with in the normal next generation (IP network) telephone network, can now also be offered in hybrid SIP fixed networks.
Die Erfindung wird im folgenden anhand eines figurlich darge- stellten Ausfuhrungsbeispiels naher erläutert. The invention is explained in more detail below on the basis of a figurative exemplary embodiment.
Es zeigen: Show it:
Figur 1 die grundsatzlichen Verhaltnisse zwischen PSTN- und/ oder mobilen Teilnehmern, zwischen denen einFigure 1 shows the basic relationships between PSTN and / or mobile subscribers, between which one
Internetnetz angeordnet ist, Internet network is arranged
Figur 2 die konkrete Ausgestaltung eines FMC Netzes,  FIG. 2 shows the concrete design of an FMC network,
Figur 3 das IM Subsystem gemass Standard TS24.229, Fig. 1 zeigt die grundsatzlichen Verhaltnisse zwischen PSTN- und/ oder mobilen Teilnehmern, zwischen denen ein Internetnetz angeordnet ist. Hier sind beispielhaft 2 PSTN-Netze of- fenbart, in denen jeweils eine Mehrzahl von PSTN-Teilnehmern in bekannter Weise angeschlossen sind. Diese sind an Ortsvermittlungsstellen LE herangeführt, die ihrerseits mit Transit-Vermittlungsstellen TX verbunden sind. 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- Ubertragungsnetz fungiert und werden über das betreffende Ubertragungsnetz paketorien- tiert übertragen. Das Media Gateway MG A wird von dem Media Gateway Controller MGC A ebenso gesteuert, wie das Media Gateway 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 unterstutzt. Dieses kann beispielsweise das MGCP oder das H.248 Protokoll sein. Zwischen den beiden Media Gateway Controllern MGC A, MGC B wird vorzugsweise gemass vorliegendem Ausfuhrungsbeispiel das SIP Protokoll verwendet. Schliesslich ist am Media Gateway Cont- roller MGC B ein Subsystem IMS mit Einrichtungen P-CSCF, PDF herangeführt, über das mobile Teilnehmer mit z. B. den PSTN Teilnehmern verbindbar sind. Im Grunde handelt es sich bei der in Fig. 1 aufgezeigten Konfiguration bereits um ein FMC Netz in seiner einfachsten Ausprägung. FIG. 3 the IM subsystem according to standard TS24.229, 1 shows the basic relationships between PSTN and / or mobile subscribers, between whom an Internet network is arranged. Two PSTN networks are disclosed here by way of example, in each of which a plurality of PSTN subscribers are connected in a known manner. These are brought up to local exchanges LE, which in turn are connected to transit exchanges TX. In the transit exchanges TX, the separation between signaling information and useful information is now carried out. The signaling information is supplied by the transit exchange TX directly to an associated media gateway controller MGC (MGC A or MGC B) via an ISUP protocol. The user information is transmitted to a 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 is transmitted in a packet-oriented manner via the transmission network in question. The media gateway MG A is controlled by the media gateway controller MGC A in the same way as the media gateway MG B by the media gateway controller MGC B. In the case of a transmission of the useful information from the media gateway MG A to the media gateway MG B, the useful information is again under Control of the media gateway controller MGC B assigned to the media gateway MG B is converted into a TDM data stream and fed to the PSTN subscriber in question. The data transmitted between the media gateway controller MGC and the respectively assigned media gateway are supported by a standardized protocol. This can be, for example, the MGCP or the H.248 protocol. According to the present exemplary embodiment, the SIP protocol is preferably used between the two media gateway controllers MGC A, MGC B. Finally, an IMS subsystem with facilities P-CSCF, PDF is introduced at the Media Gateway Controller MGC B. B. the PSTN participants can be connected. Basically it is about 1 already has an FMC network in its simplest form.
Fig. 2 zeigt ein FMC Netz mit einer Mehrzahl von Strukturen. Demgemass ist eine Mehrzahl von vermaschten Netzen entnehmbar. Hierzu zahlen mobile (GRPS, UMTS) und feste (xDSL, LAN) Teilnehmerzugangsnetze ebenso, wie drahtlose Teilnehmerzugangsnetze (WLAN). Als Ubergangspunkt sind jeweils Netze IM Subsysteme IMS oder Domänen angeordnet. 2 shows an FMC network with a plurality of structures. Accordingly, a plurality of meshed networks can be removed. This includes mobile (GRPS, UMTS) and fixed (xDSL, LAN) subscriber access networks as well as wireless subscriber access networks (WLAN). Networks IM subsystems IMS or domains are arranged as transition points.
Fig. 3 zeigt die Definition und Aufgaben des IMS Systems ge- mass 3GPP TS 23.002 V6.5.0 (2004-06) Standard. Hierbei ist eine BGCF (Breakout gateway control function) Funktionalitat, beschrieben. Ferner sind Einrichtungen CSCF, P-CSCF sowie weitere Einrichtungen aufgezeigt, deren Zusammenwirken ebenfalls in obigem Standard erläutert ist. Beispielsweise wird von der BGCF Funktion (Breakout Gateway Control Funktion) das Netz (Domäne, z. B. PSTN) ausgewählt, in das der von einem SIP Endgerat UE ausgehende Ruf geleitet werden soll. Wenn die BGCF Funktion festlegt, dass das Ziel im eigenen Netz liegt, d. h. in dem Netz, in dem die BGCF Funktion angeordnet ist, wählt die BGCF Funktion eine MGCF Funktionalitat aus, die für das Interworking mit dem PSTN Netz verantwortlich ist. Wenn das Ziel in einem anderen Netz liegt, reicht die BGCF Funk- tion die Signalisierung in das andere Netz weiter. 3 shows the definition and tasks of the IMS system according to 3GPP TS 23.002 V6.5.0 (2004-06) standard. A BGCF (Breakout gateway control function) functionality is described here. Furthermore, facilities CSCF, P-CSCF and other facilities are shown, the interaction of which is also explained in the above standard. For example, the BGCF function (breakout gateway control function) selects the network (domain, e.g. PSTN) into which the call originating from a SIP terminal UE is to be routed. If the BGCF function determines that the destination is in its own network, i. H. in the network in which the BGCF function is arranged, the BGCF function selects an MGCF functionality that is responsible for interworking with the PSTN network. If the destination is in another network, the BGCF function passes the signaling on to the other network.
Schliesslich kann Fig. 3 die Einrichtung P-CSCF entommen werden, die als Steuerung der Schnittstelle Gq fungiert. Hier ist eine Funktion PDF (Policy Description Function) abgelegt, die die Regeln im Netz vorgibt. Tauschen beispielsweise 2 Endgerate SDP Daten aus, so werden diese von der Einrichtung P-CSCF abgegriffen und der Funktion PDF zugeführt. Wird von letzterer ermittelt, dass die vorgegebenen Regeln verletzt sind, wird der Bearer nicht freigegeben und beide Teilnehmer können nicht wie geplant miteinander kommunizieren. Finally, FIG. 3 shows the device P-CSCF, which functions as control of the interface Gq. A function PDF (Policy Description Function) is stored here, which specifies the rules in the network. If, for example, 2 terminal devices exchange SDP data, these are picked up by the P-CSCF device and supplied to the PDF function. If the latter determines that the specified rules have been violated, the bearer is not released and both participants cannot communicate with one another as planned.
Es wird nun vorgeschlagen, die Schnittstelle Gq in ihrer Funktionalitat zu erweitern: In einer ersten Ausgestaltung wird vorgesehen, die Schnittstelle Gq um das SDP Datum „IMAGE" zu erweitern. Ferner ist die das SDP Datum „IMAGE" in die Funktion PDF der Einrichtung P-CSCF zu integrieren. Die abgegriffenen SDP Daten haben beispielsweise im Media-Line Feld folgende Struktur: It is now proposed to expand the functionality of the interface Gq: In a first embodiment, it is provided that the interface Gq is extended by the SDP date “IMAGE”. Furthermore, the SDP date “IMAGE” is to be integrated into the function PDF of the device P-CSCF. The tapped SDP data have the following structure in the Media Line field, for example:
"AUDIO (O)", "VIDEO (I)", "DATA (2)", "APPLICATION (3)", "CONTROL (4)", "IMAGE (5)" "AUDIO (O)", "VIDEO (I)", "DATA (2)", "APPLICATION (3)", "CONTROL (4)", "IMAGE (5)"
Da der Wertebereich der Schnittstelle Gq um das SDP Datum "IMAGE" erweitert wurde, unterbleibt das Blockieren bei Eintreffen dieses SDP Datums „IMAGE". Die Funktion PDF kann daraufhin ermitteln, ob die vorgegebenen Regeln - in die das SDP Datum „IMAGE" nun einegbunden ist - verletzt sind, und gibt den Bearer frei. Beide Teilnehmer können dann wie geplant über FAX T.38 miteinander kommunizieren Since the value range of the interface Gq has been extended by the SDP date "IMAGE", blocking does not occur when this SDP date "IMAGE" arrives. The PDF function can then determine whether the specified rules - in which the SDP date "IMAGE" are now integrated is - are injured, and releases the bearer. Both participants can then communicate with each other via FAX T.38 as planned
In einer zweiten Ausgestaltung wird vorgesehen, dass grund- sätzlich alle SDP Daten abgegriffen werden und transparent - also ohne Filterfunkition, die ein unbekanntes SDP Datum abweisen könnte - der Einrichtung P-CSCF und damit der Funktion PDF zugeführt werden. In a second embodiment, it is provided that all SDP data are in principle tapped and sent to the device P-CSCF and thus the PDF function in a transparent manner, ie without a filter function which could reject an unknown SDP date.

Claims

Patentansprüche Claims
1. Verfahren zur Unterstützung von Diensten in FMC Netzen, die aus wenigstens einem Festnetzanteil und wenigstens einem, ein Subsystem (IMS) umfassenden Anteil gebildet sind, und in denen zwischen Teilnehmern endpunktspezifische, bearer relevante Daten ausgetauscht werden, wobei wenigstens eines der Daten kennzeichnend für den betreffenden Dienst ist, dadurch gekennzeichnet, 1. Method for supporting services in FMC networks which are formed from at least one fixed network part and at least one part comprising a subsystem (IMS) and in which endpoint-specific, bearer-relevant data are exchanged between subscribers, at least one of the data being characteristic of the service in question is characterized by
dass der Wertebereich der Schnittstelle (Gq) des Subsystems (IMS) um das für den betreffenden Dienst kennzeichnende wenigstens eine Datum erweitert wird, wodurch dieses bei Eintreffen einer Policyfunktion (PDF) übergegeben wird. that the value range of the interface (Gq) of the subsystem (IMS) is extended by the at least one date that characterizes the service in question, whereby this is transferred when a policy function (PDF) arrives.
2. Verfahren nach Anspruch 1, 2. The method according to claim 1,
dadurch gekennzeichnet, characterized,
dass der Dienst T.38 Fax Anwendungen umfasst. that the service includes T.38 fax applications.
3. Verfahren nach Anspruch 2, 3. The method according to claim 2,
dadurch gekennzeichnet, characterized,
dass das für T.38 Fax Anwendungen kennzeichnende wenigstens eine Datum im Media-line Feld des SDP Protokolls geführt wird. that the at least one date characterizing T.38 fax applications is recorded in the media-line field of the SDP protocol.
4. Vorrichtung nach Anspruch 1 bis 3, 4. The device according to claim 1 to 3,
dadurch gekennzeichnet, characterized,
dass das für T.38 Anwendungen kennzeichnende Datum das SDP Datum „IMAGE" ist. that the date characteristic for T.38 applications is the SDP date "IMAGE".
5. Vorrichtung zur Unterstützung von Diensten in FMC Netzen, die aus wenigstens einem Festnetzanteil und wenigstens einem, ein Subsystem (IMS) umfassenden Anteil gebildet sind, und in denen zwischen Teilnehmern endpunktspezifische, bearer relevante Daten ausgetauscht werden, wobei wenigstens eines der Daten kennzeichnend für den betreffenden Dienst ist, dadurch gekennzeichnet, 5. Device for supporting services in FMC networks which are formed from at least one fixed network part and at least one part comprising a subsystem (IMS) and in which endpoint-specific, bearer-relevant data are exchanged between participants, at least one of the data being characteristic of the service in question is characterized by
dass der Wertebereich der Schnittstelle (Gq) des Subsystems (IMS) um das für den betreffenden Dienst kennzeichnende wen- igstens eine Datum erweitert ist, wodurch bei Eintreffen dieses einer Policyfunktion (PDF) übergegeben wird. that the range of values of the interface (Gq) of the subsystem (IMS) is extended by at least one date, which is characteristic of the service in question, so that upon arrival this is passed on to a policy function (PDF).
6. Vorrichtung nach Anspruch 5, 6. The device according to claim 5,
dadurch gekennzeichnet, characterized,
dass der Dienst T.38 Fax Anwendungen umfasst. that the service includes T.38 fax applications.
7. Vorrichtung nach Anspruch 5, 6, 7. The device according to claim 5, 6,
dadurch gekennzeichnet, characterized,
dass das Media-line Feld des SDP Protokolls das für T.38 Fax Anwendungen kennzeichnende wenigstens eine Datum führt. that the media-line field of the SDP protocol contains the at least one date which characterizes T.38 fax applications.
8. Vorrichtung nach einem der Ansprüche 5 bis 6, 8. Device according to one of claims 5 to 6,
dadurch gekennzeichnet, characterized,
dass das für T.38 Anwendungen kennzeichnende Datum das SDP Datum „IMAGE" ist. that the date characteristic for T.38 applications is the SDP date "IMAGE".
9. Vorrichtung nach einem der Ansprüche 5 bis 8, 9. Device according to one of claims 5 to 8,
dadurch gekennzeichnet, characterized,
dass die Policyfunktion (PDF) in Wirkverbindung mit dem Bearer steht. that the policy function (PDF) is in active connection with the bearer.
PCT/EP2006/065623 2005-12-05 2006-08-24 Device and method for supporting fax t.38 applications in fmc networks WO2007065738A1 (en)

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