EP1665756A1 - Interfonctionnement de protocoles dans des reseaux multimedia hybrides - Google Patents

Interfonctionnement de protocoles dans des reseaux multimedia hybrides

Info

Publication number
EP1665756A1
EP1665756A1 EP04787098A EP04787098A EP1665756A1 EP 1665756 A1 EP1665756 A1 EP 1665756A1 EP 04787098 A EP04787098 A EP 04787098A EP 04787098 A EP04787098 A EP 04787098A EP 1665756 A1 EP1665756 A1 EP 1665756A1
Authority
EP
European Patent Office
Prior art keywords
sip
network
sip message
interworking
protocol
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Withdrawn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
EP04787098A
Other languages
German (de)
English (en)
Inventor
Klaus Hoffmann
Sven Sabrowski
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
Siemens AG
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 Siemens AG, Nokia Siemens Networks GmbH and Co KG filed Critical Siemens AG
Publication of EP1665756A1 publication Critical patent/EP1665756A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04M7/126—Interworking of session control protocols
    • H04M7/127—Interworking of session control protocols where the session control protocols comprise SIP and SS7
    • 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
    • H04L65/1043—Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
    • 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
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/08—Protocols for interworking; Protocol conversion
    • 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
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2207/00—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place
    • H04M2207/12—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place intelligent networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2207/00—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place
    • H04M2207/20—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place hybrid systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation

Definitions

  • Line-oriented networks also called voice networks, telephone networks or Public Switched Telephone Network (PSTN) - are designed for the transmission of continuously flowing (voice) information, referred to in the technical field as (voice) connection, conversation or call.
  • the information is usually transmitted with high quality of service and security.
  • a minimal - e.g. ⁇ 200 ms - Delay without fluctuations in the delay time (delay jitter) is important because speech requires a continuous flow of information when it is played back in the receiving device.
  • a loss of information cannot therefore be compensated for by retransmitting the non-transmitted information and usually leads to acoustically perceptible disturbances in the receiving device (e.g. crackling, distortion, echo, silence).
  • the transmission of speech is also generally referred to as real-time (transmission) service or as real-time service.
  • Packet-oriented networks - also called data networks - are designed for the transmission of packet streams, which are also referred to in the technical field as data packet streams, session or flow.
  • packet streams which are also referred to in the technical field as data packet streams, session or flow.
  • the transmission takes place without guaranteed quality of service the data packet streams, for example, with delays fluctuating over time, since the individual data packets of the data packet streams are usually transmitted in the sequence in which they are accessed, ie the more packets to be transmitted from a data network, the greater the time delays.
  • the transmission of data is therefore also referred to as a transmission service without real-time conditions or as a non-real-time service.
  • the packets usually differ depending on the type of packet-oriented network. For example, they can be configured as Internet, X.25 or frame relay packets, but also as ATM cells. They are sometimes referred to as messages, especially then when a message is delivered in a packet.
  • the Internet is a well-known data network. Because of the Internet protocol IP used there, this is sometimes also called the IP network, although this term is to be understood broadly and encompasses all networks in which the IP protocol is used.
  • IP Internet protocol
  • the Internet is designed as an open (wide area) data network with open interfaces for connecting (mostly local and regional) data networks from different manufacturers. It provides a transport platform that is independent of the manufacturer.
  • Connections are communication relationships between at least two participants for the purpose of a - mostly mutual, ie bi-directional - information transfer.
  • the subscriber initiating the connection is usually referred to as "A subscriber”.
  • a subscriber connected by means of a connection with an A subscriber is called “B subscriber”.
  • connections also represent clear paths through the network on a physical level, along which the information is transmitted.
  • Signaling is used to coordinate network components with one another, but not for the "actual" transmission of information in the above sense.
  • the information transmitted for signaling is usually referred to as signaling information, signaling data or simply signaling.
  • the term is to be understood broadly. For example, also includes the messages for the control of registration, admission and status (RAS), the messages for the control of user channels of existing calls (e.g. in accordance with the H.245 standard) and all other similarly designed messages.
  • the "actual information” is also called useful information, payload, media information, media data or simply media to distinguish it from the signaling.
  • Communication relationships that serve to transmit the signaling are also referred to below as signaling connections.
  • the communication relationships used to transmit the user information are e.g. Speech connection, user channel connection or - simplified - user channel, bearer channel or simply called bearer.
  • out-of-band or outband means the transmission of information in a different way / medium than that provided in the communication network for the transmission of signaling and useful information.
  • this includes a local configuration of devices on site, which is carried out, for example, with a local control device.
  • in-band information is separated in the same way / medium, possibly logically from the signaling and User information transmitted.
  • voice transmission services and increasingly also broadband services such as Transmission of moving picture information also implemented in packet-oriented networks, i.e.
  • the transmission of the real-time services that have hitherto usually been line-oriented is carried out in a convergent network - also called voice-data network or multimedia network - in a packet-oriented manner, i.e. in packet streams.
  • Realtime packet streams called.
  • the transmission of voice information over a packet-oriented IP network is also identified with 'VoIP' (Voice over IP).
  • the basic H.323 standard defines the transport of voice, data and video streams over an IP network. Audio and video streams are transmitted in accordance with the RTP / RTCP protocol.
  • the connection control is caused by the H.225 protocol, which enables the signaling, registration and synchronization of media streams.
  • the H.323 architecture primarily provides the following types of functional units: terminal, e.g. a terminal in a local area network (LAN), for bi-directional real-time communication with other end devices, gatekeeper for performing connection control, media gateway (MG) at the interface to other networks for converting H.323 formats into the formats these networks,
  • MSC Media gateway controller
  • Session Description Protocol SDP
  • RFC2327 RFC2327
  • IP address of the Bearer Connection RTP / UDP port of the Bearer Connection (depending on whether there is a voice or data transmission) Codec (s) that can be used for voice or data transmission Stream mode of the Bearer Connection
  • a SIP proxy server can be used for a connection setup, for example if the connected endpoints do not know each other. It can also be designed to evaluate, change and / or forward a received request for a client (eg an IP telephone, a PC or a PDA).
  • MG and MGC are also provided at the interface to other networks.
  • the MGCP protocol Media Gateway Control Protocol
  • the MGCP protocol is used to control the MG. It is common to both architectures that the connection control level and the resource control level are functionally clearly separated from each other and are usually even implemented on different hardware platforms.
  • connection control level is used for the controlled activation and deactivation of network services.
  • it can include dedicated connection controllers, to which the following functions can be assigned: - Address translation: conversion of E.164 telephone numbers and other alias addresses (e.g. computer names) to transport addresses (e.g. Internet addresses).
  • - Admission control check whether and / or to what extent use of the communication network is permitted.
  • - Alias Address Modification Return of a modified alias address, which is used by endpoints e.g. be used to establish a connection.
  • Bandwidth control management of transmission capacities, e.g. by controlling the permissible number of devices that can use the communication network at the same time.
  • Connection authorization admissibility check for incoming and outgoing connection requests.
  • Connection control signaling switching and / or processing of signaling messages.
  • Dialed Digit Translation Translation of the dialed digits into an E.164 telephone number or a number from a private numbering scheme.
  • the Resource Control level is used for the regulated implementation of activated services.
  • network resources e.g. Transmission node
  • resource controllers which can be assigned the following functions:
  • - Capacity control control of the traffic volume supplied to the communication network, e.g. through control and if necessary. Limiting the permissible transmission capacity of individual packet streams.
  • Priority management Preferred transmission of priority traffic flows, e.g. with the help of priority indicators, which are provided in priority packets.
  • connection controllers are those of the ITU in the H.323 gatekeeper or the SIP proxy. If a larger communication network is divided into several domains - also called 'zones' - a separate connection controller can be provided in each domain. A domain can also be operated without a connection controller. If several connection controllers are provided in a domain, only one of them should be activated. From a logical point of view, a connection controller should be seen separately from the facilities. Physically, however, it does not have to be implemented in a separate connection controller device, but can also be implemented in each end point of a connection (for example in the form of an H.323 or SIP terminal,
  • Media gateway multipoint control unit
  • a device that is primarily designed for program-controlled data processing (for example: computer, PC, server).
  • program-controlled data processing for example: computer, PC, server.
  • a physically distributed implementation is also possible.
  • connection controller is a media gateway controller, to which the optional functions connection control signaling and connection management are usually assigned. Furthermore, the assignment of a signaling conversion function to implement different (signaling) protocols is conceivable, for example at the border of two different networks that are combined to form a hybrid network.
  • the resource controller is also known as a 'Policy Decision Point (PDP)'. It is implemented, for example, within so-called edge routers - also called edge devices, access nodes or, when assigned to an Internet service provider (ISP), also called provider edge routers (PER). These edge routers can also be designed as media gateways to other networks to which the multimedia networks are connected. These media gateways are then connected both to a multimedia network and to the other networks and are used internally for the implementation between the different (transmission) protocols of the different networks.
  • the resource controller can also be designed only as a proxy and forward information relevant to the resource controller to a separate device on which the relevant information is processed in accordance with a function of the resource controller.
  • connection controller Connection Controller Routed Signaling - CCRS
  • Dire ⁇ t Endpoint Routed Signaling - DERS directly between the end devices
  • all signaling messages are transmitted by at least one call controller. All facilities send and receive signaling messages only via the call controller. A direct exchange of signaling messages between the facilities is prohibited.
  • connection controller With DERS, copies of selected signaling messages can be transmitted to the connection controller, so that a connection controller also knows about this variant can have the existing connections between the terminals. However, these connections are not actively influenced or verified by himself.
  • the function split between the two levels can be described in such a way that only those functions are assigned to the resource control level that are necessary for the transmission of useful information, while the connection control level includes the intelligence for controlling the resource control level.
  • the facilities at the resource control level have as little network control intelligence as possible and can subsequently be implemented in an economically particularly advantageous manner on separate hardware platforms. This is a particularly nice advantage because of the higher number of installations compared to the Connection Control level.
  • Interworking between two different protocols can be effected indirectly or directly.
  • third protocol is switched between the two protocols - for example the protocol BICC (Bearer Independent Call Control) according to the standard Q.1902 or the protocol SIP_T (SIP for Telephones), which is described in the standard RFC3372.
  • the direct interworking takes place directly between the two different protocols, ie without the use of a •. Interim protocol.
  • the invention is based on the knowledge that during the evolution of hybrid networks which result from the interconnection of proven line-oriented networks with modern multimedia networks, many of the features which have long been established in the line-oriented networks are not or at least not fully supported. One reason for this is seen in the large number of new interworking interfaces and protocols, of which the previous features are not yet or not fully supported.
  • the invention is based on the knowledge that the differentiated specifications for bearer handling in PSTN networks and in SIP networks do not match. While in PSTN networks the partner is signaled that their own If the sending direction is blocked, the partner must be signaled in SIP networks that the partner has to interrupt the (from the point of view of the signaling party) the remote sending direction, since in SIP networks only their own sending direction, but not their own receiving direction, is separated. In other words: In SIP networks, each SIP subscriber suppresses its own transmission direction by deactivating its transmitter (see IETF standard RFC3264, section 8.4).
  • the invention is based on the knowledge that the "remote hold” and “remote retrieve” indicators are used not only during the performance of the HOLD feature, but also when performing the performance features 3PTY and CONF. As a result, the establishment of a conference due to the "remote hold” indicators used in addition to the central interruption of the connections in the PSTN network is accompanied by a deactivation of the SIP-side transmitter.
  • FIG. 1 shows an exemplary arrangement for carrying out the method according to the invention with a hybrid communication network, consisting of two packet-oriented multimedia networks and a line-oriented voice network, which are connected by intermediary media gateways, media gateway controllers and SIP proxies, as well as an end point of a common performance feature in FIG each of the three networks
  • Figure 2 is a flowchart in which an embodiment of the invention is shown as an example
  • FIG. 1 shows an exemplary arrangement for carrying out the method according to the invention. It comprises a line-oriented network PSTN ⁇ and two multimedia networks IN B and IN C , which are preferably designed as integrated voice data networks SDN.
  • the PSTN A , IN B and IN C networks are combined to form a hybrid network.
  • the networks IN are preferably designed as IP networks and each include a SIP proxy SP B or SP C as a call controller. It is obvious to the person skilled in the art that the invention can of course be used in any packet-oriented networks IN, such as, for example, the Internet, intranet, extranet, a local area network (LAN) or egg.
  • nem for example, a virtual private network (VPN) designed in-house network (corporate network).
  • VPN virtual private network
  • a subscriber A is connected to the network PSTN A using a conventional telephone T, subscribers B and C are connected to the networks IN B and IN C using SIP-capable telephones - for example SIP clients SC implemented in software.
  • a connection is provided between the subscribers A and B, which includes as bearer an end-to-end user channel TDM A / B , RTP / RTCP A / B.
  • a further connection is provided between subscriber A and C, which as bearer comprises an end-to-end user channel TDM A / C , RTP / RTCP A / C.
  • the subscriber A is assigned a line-oriented switching device LE A , comprising a controller for features 3PTY or CONF, with which the connections can be configured as part of the features, in particular connected to one another and isolated from one another in the context of a conference.
  • the combination of the line-oriented Bearer TDM with the packet-oriented Bearer RTP / RTCP is done by an intermediate Media Gateway MG for the conversion between different, network-specific user channel technologies RTP / RTCP (Real Time [Control] Protocol) and TDM (Time Division Multiplex), the combination of the SS7 signaling of the PSTN network with the SIP signaling of the IN networks by means of intermediate media gateway controllers MGC A / B and MGC C.
  • the controller MGC A / B effects direct interworking between the different network-specific signaling protocols ISUP of the network PSTN and SIP B of the network IN B.
  • a protocol BICC or SIP_T is used between the controllers MGC A / B and MGC C for indirect interworking between the different signaling protocols ISUP of the network PSTN and SIP C of the network IN C.
  • the gateway MG is controlled by the controller MGC A / B assigned to it by a - preferably internationally standardized - protocol, for example MGCP (Media Gateway Control Protocol) or H.248. It is usually implemented as a separate unit which runs on a different physical device / hardware platform than the MGC AB controller assigned to it.
  • MGCP Media Gateway Control Protocol
  • H.248 Media Gateway Control Protocol
  • FIG. 2 shows the sequence of first ISUP messages for setting up the connection CALL A / B between participants A and B and the sequence of second ISUP messages for expanding the connection CALL A / B to a conference with a further connection set up for this purpose CALL A / C shown between participants A and C. Furthermore, the interworking of the first ISUP messages on the SIP B protocol and the inventive interworking of the second messages on the SIP B and SIP C protocols are shown.
  • connection CALL A / B is set up between subscribers A and B in a customary manner, the initiative coming from SIP subscriber B in FIG. 2, but could also originate from PSTN subscriber A without restriction.
  • the SIP signaling SIP: Invite (SDP B ) is mapped to the ISUP signaling 0: IAM when interworking between the first protocol ISUP and the second protocol SIP.
  • the ISUP signaling 0: ACM and 0: ANM with which the ringing of the telephone T and the acceptance of the call by the subscriber A are indicated, are in the usual way on the SIP messages 180: ringing and 200: OK (SDP MG c_ B ) pictured.
  • connection CALL A / B comprises at least one (usually bi-directional in a telephone conversation) user channel TDM A / B , RTP / RTCP A / B for transmitting information between subscribers A and B.
  • This channel is shown in FIG ,
  • the existing CALL A / B conversation is to be expanded to a 3PTY conference with the C participant.
  • the initiative comes from PSTN participant A.
  • the connection CALL A / B is first put on HOLD by sending the ISUP message 0: CPG (RemoteHold).
  • the user channel TDM A / B , RTP / RTCP A / B in the switching center LE A is interrupted centrally in both transmission directions (see FIG. 1).
  • SIP defined.
  • connection CALL A / c to subscriber C is then established from subscriber A in the usual way.
  • the connection CALL A / C comprises at least one user channel TDM A / C , RTP / RTCP A / C for transmitting information between subscribers A and C. This channel is shown in FIG.
  • participant A After connection CALL A / C has been set up , participant A initiates the interconnection of the two connections CALL A / B and CALL A / C to form a (small) 3PTY conference.
  • This interconnection is effected in the usual way by the exchange LE A of the network PSTN (see FIG. 1).
  • the two user channels TDM AB , RTP / RTCP A / B and TDM A / C , RTP / RTCP A / c are interconnected there so that all three participants can hear each other.
  • This configuration of the connections CALL is communicated to the subscribers B and C concerned with the aid of two ISUP messages 0: CPG (ConferenceEstablished) which are addressed specifically to them, ie this message is sent to both subscribers B, C.
  • CPG ConferenceEstablished
  • the two messages 0: CPG ConferenceEstablished
  • the interworking to subscriber B is designed in such a way that the sending direction of the SIP client SC is reactivated by sending a SIP message SIP: Invite (SDP M GC B ) r ie by specifying the IP address of the controller MGC B (see FIG. 2).
  • participant B has transmitted information bi-directionally or uni-directionally, or also by sending a SIP message SIP: Invite without this attribute line. After the interworking has been carried out, participant B can also be heard in the 3PTY conference.
  • this interworking is also dispensed with if subscriber B has already been reactivated before receipt of ISUP message 0: CPG (ConferenceEstablished). To do this, the status of participant B is checked before interworking. In the "held" status, a SIP message SIP: must be sent, otherwise not.
  • the invention can also be used if there is no ISUP, BICC between the PSTN subscribers (ISDN, analog subscriber or also mobile subscriber) and the SIP or SIP-T subscribers. The above-mentioned method would then normally be carried out within switching centers. Interworking of NGN (Next Generation Network) participants such as VoDSL (Voice over Digital Subscriber Line), H323, etc.
  • NGN Next Generation Network

Abstract

Selon l'invention, au cours de la configuration de connexions dans un réseau hybride, comprenant des réseaux RTPC et IN, des messages générés dans le réseau RTPC sont reproduits dans des messages des réseaux IN si une interruption décentralisée des connexions a été auparavant déclenchée dans les réseaux IN par désactivation des émetteurs unidirectionnels à l'extrémité des connexions et si le type de la configuration nécessite une activation des émetteurs dans les réseaux IN. Il est ainsi possible, de manière avantageuse, de proposer les compléments de service 3PTY et CONF du réseau RTPC également en cas d'interfonctionnement avec des réseaux IN, aucune information utile n'étant transmise dans les réseaux IN tant qu'une connexion est isolée d'une conférence.
EP04787098A 2003-09-12 2004-09-03 Interfonctionnement de protocoles dans des reseaux multimedia hybrides Withdrawn EP1665756A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10342294A DE10342294A1 (de) 2003-09-12 2003-09-12 Interworking von Protokollen hybrider Multimedianetze
PCT/EP2004/052031 WO2005027487A1 (fr) 2003-09-12 2004-09-03 Interfonctionnement de protocoles dans des reseaux multimedia hybrides

Publications (1)

Publication Number Publication Date
EP1665756A1 true EP1665756A1 (fr) 2006-06-07

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Country Link
US (1) US20070041357A1 (fr)
EP (1) EP1665756A1 (fr)
CN (1) CN1849808A (fr)
DE (1) DE10342294A1 (fr)
WO (1) WO2005027487A1 (fr)

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Also Published As

Publication number Publication date
DE10342294A1 (de) 2005-04-28
US20070041357A1 (en) 2007-02-22
CN1849808A (zh) 2006-10-18
WO2005027487A1 (fr) 2005-03-24

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