EP1794990A1 - Procede et dispositif pour commander un flux de donnees lors d'une communication entre des utilisateurs de centrex ip - Google Patents

Procede et dispositif pour commander un flux de donnees lors d'une communication entre des utilisateurs de centrex ip

Info

Publication number
EP1794990A1
EP1794990A1 EP05796945A EP05796945A EP1794990A1 EP 1794990 A1 EP1794990 A1 EP 1794990A1 EP 05796945 A EP05796945 A EP 05796945A EP 05796945 A EP05796945 A EP 05796945A EP 1794990 A1 EP1794990 A1 EP 1794990A1
Authority
EP
European Patent Office
Prior art keywords
network
address
centrex
user data
communication network
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Withdrawn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
EP05796945A
Other languages
German (de)
English (en)
Inventor
Renate Zygan
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
Priority to EP05796945A priority Critical patent/EP1794990A1/fr
Publication of EP1794990A1 publication Critical patent/EP1794990A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2521—Translation architectures other than single NAT servers
    • H04L61/2535—Multiple local networks, e.g. resolving potential IP address conflicts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • 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
    • H04M2207/45—Type of exchange or network, i.e. telephonic medium, in which the telephonic communication takes place public-private interworking, e.g. centrex

Definitions

  • the invention relates to a method for controlling the Ubertragungsweges Nutz Schemes, in a
  • Centrex Central Office Exchange
  • PBX private private branch exchange
  • the service provider provides the Centrex functionality in the form of software on the platform of a public switching node.
  • IP-PBX voice server within the corporate network
  • IP-Centrex voice server provided by a Centrex service provider outside of the company network
  • IP-Centrex refers to an IP network architecture in which the Centrex functionality is offered to a customer from a service provider's network and that customer makes his telephone calls in the form of a packet data stream over the broadband network access of the service provider's network transmitted.
  • IP-Centrex offers a number of other benefits to a business. IP-Centrex enables a customer to consolidate existing data and phone service solutions into one network. Furthermore, the geographical location of the communication participants no longer plays any role when a Centrex group is defined. Since the transmission of the voice information in the form of data packets over the Internet, there are comparatively low call costs, which are largely independent of the distance.
  • VoIP Voice over Internet Protocol
  • H.323 for the ITU
  • SIP Session Initiation Protocol
  • RTP / RTPC Real Time Protocol / Real Time Control Protocol
  • IP Centex server Network Address Translation
  • the object of the invention is to specify a method and a device for controlling the data stream in a communication between IP Centrex subscribers so that less bandwidth is claimed in the broadband transmission channel.
  • the useful data stream is looped via the broadband connection into the public network only if the user data, ie the voice packets, has to be processed by the IP Centrex server. This is the case, for example, when the IP Centrex server wants to send an announcement to one or more subscribers of the IP Centrex group.
  • the service logic in the IP Centrex server does not require access to the voice packets, these are intercepted at the network boundary of the private corporate network in a gateway router, routed back to the private network and delivered to the respective communication partner.
  • no more bandwidth is occupied than is necessary.
  • a preferred embodiment of the invention is characterized in that the following steps are carried out in the network boundary unit: a) recognition of user data packets; b) determining whether an address translation function is active for a destination IP address and a sender IP address of a user data packet sent by a user; c) converting the sender IP address specified in the user data packet into an IP address used in the address space of the second communication network for this sender and the destination IP address in an IP address used for this destination in the first communication network, if the respective address translation function for each of these addresses is active; d) redirecting the user data packet into the first communication network (1).
  • a further advantageous embodiment of the method according to the invention is characterized in that the signaling information is brought from the network element to the network boundary unit and the address translation function is controlled by the network element.
  • the bearer ie the voice packets can be routed to the voice server as needed.
  • the signaling information is transmitted by means of a signaling protocol to the network boundary unit, wherein on the signaling path between the network element and the network boundary device
  • Signaling protocol is extended by a parameter field in which a, directed by the network element to the address translation function control information is transmitted. This expansion of available signaling protocols requires only a relatively small effort.
  • Another advantage of the method according to the invention can be seen in the fact that in conversations between Centrex subscribers within a company, the time delay of the user data packets is lower because a forwarding into the service provider network does not take place. This improves the quality of voice transmission.
  • an address translation is not necessary.
  • the voice server in the service provider network By transmitting corresponding control information from the voice server in the service provider network to the gateway router in the corporate network, it is ensured that the address translation not required in this case is turned off. The consequence of this is that the delay of the voice packets is lower in external calls, which also improves the voice transmission quality.
  • Figure 1 is an IP Centrex network structure consisting of a private network of a company via a
  • Broadband network access is connected to the network of a service provider, wherein the steering of the user data stream is carried out according to the prior art
  • FIG. 2 shows the IP Centrex network structure according to FIG. 1, with a steering of the user data stream according to an exemplary embodiment of the invention.
  • FIG. 1 shows an IP Centrex network structure in which a packet-switching, private communications network 1 of a company is connected via a broadband access 3 to a second, packet-switching communications network 2 of a Centrex service provider.
  • subscribers A and B are assigned to a centrex group.
  • a Centrex voice server 7 is made.
  • the voice server 7 manages the services and features of the Centrex subscribers A and B.
  • the analog voice information is digitized, compressed and in the form of user data packets, ie voice packets via router (in Figure 1 and Figure 2 only the routers 5 and 14 are drawn), forwarded to the communication partner according to certain rules.
  • the dialed number is converted to an IP address.
  • the IP address appears as destination information in the message header of each data packet.
  • Each IP address consists of four bytes or four quads separated by dots.
  • the transmission of the user data packets takes place according to the
  • the signaling information is transmitted in the network 1 and in the network 2 in accordance with the ITU standard H.323 or in accordance with the SIP protocol of the IETF.
  • the terminal 11 has in the address space of the company network 1 (172.31.0.xyz) the IP address 172.31.0.1/ the terminal 12 has in this address space the IP address 172.31.0.2.
  • the broadband network access 3 is connected to a network boundary unit, a gateway router 5.
  • the gateway router 5 has on the one hand the functionality of a firewall 4. On the other hand, it has the functionality of address translation (NAT Network Address Translation), since the IP address space in the company network 2 and the IP address space in the network 2 of the network operator i.A. is different.
  • IP packets that are exchanged as part of the voice communication between employees of the company are routed through this gateway router 5 and introduced via the broadband line 3 in the network 2 of the service provider.
  • the data stream of these IP packets includes both the IP packets required to control the connection setup, ie the signaling, and also includes the payload data stream, ie those IP packets (bearers) which are the actual ones Include voice information. So that a Voice over IP communication of the subscribers A and B can occur at all, the NAT functions must first be able to recognize the IP packets of the voice communication that are relevant for this session. Then protocol-dependent functions must be executed in these detected IP packets.
  • the IP addresses have to be changed, not only in the IP header, but also in the signaling protocol used.
  • the NAT function translates the addresses defined in the address space of the company network 1 into those of the public network 2.
  • the IP address of the A subscriber 172.31.0.1 in network 1 is converted to the IP address 207.46.130.1 in network 2.
  • For the NAT functionality are
  • this identified as a payload packet package is determined whether for the specified by a sender in the corporate network 1 destination IP address (which comes from the IP address space of the service provider network 2) and for the sender IP address (the the IP address space of the enterprise network 1 comes) ever a NAT function is active.
  • this user data packet with the converted addressing is routed back directly into the company network 1 by the gateway router 5.
  • the other user data packets of the session are handled accordingly.
  • the inventive method is shown graphically in Figure 2.
  • the representation of Figure 2 differs from the representation of Figure 1 in that according to the invention in an internal communication, for example between the Centrex subscriber A and the Centrex subscriber B, the user data packets remain in the network of the company 1 and therefore the bandwidth of the transmission channel 3 is no longer burdened with it.
  • the known H.323 or SIP NAT functionality is extended.
  • the path of the user data packets of one of the subscribers A or B no longer leads to the router 14 in the network 2, but is already intercepted in the gateway router 5 and returned to the network 1 routed.
  • the gateway router 5 performs this special treatment of RTP / RTPC packets only for such calls or NAT sessions for which this is explicitly requested by the voice server 7 of the service provider. This is it
  • H.323 / SIP modified accordingly.
  • the known H.323 or SIP protocol is extended by an optional parameter.
  • This parameter includes control information by which the address translation function awareNAT in the gateway router 5 can be controlled by the voice server.
  • MaW the parameter indicates whether the Special treatment of RTP / RTPC packets.
  • the user data can be deflected depending on demand. That is, if the voice server 7, for example, wants to transmit an announcement to the subscribers A and B, it directs the user data stream to itself. If he does not want to handle the voice packets, he instructs the gateway router 5 to direct the user data packets of an internal Centrex communication directly back into the corporate network 1.
  • network units described above such as voice server, gateway router, network boundary unit are of course not limited to a physical unit to understand, but it is clear to one skilled in the art that each of these terms a functionality is to be understood wholly or partly on several physical Facilities distributed in the network can be arranged.
  • the individual parts are advantageously realized by software. But it can also be that at least parts are formed by hardware or by firmware.
  • FIG. 1 a connection to a conventional circuit-switched telecommunications network (PSTN / ISDN) is also drawn, which is formed by the connection between the voice-over-IP router 6 of the PSTN / ISDN.
  • PSTN / ISDN circuit-switched telecommunications network

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé pour commander la voie de transmission de paquets de données utiles lors de la transmission de messages entre un premier et au moins un autre utilisateur (A, B) d'un groupe IP Centrex, dans un premier réseau de communication à commutation par paquets (1) comprenant une unité de limitation de réseau (5) qui est reliée, par l'intermédiaire d'un canal de transmission (3), à un deuxième réseau de communication à commutation par paquets (2), dans lequel des fonctionnalités et des services Centrex peuvent être mis à disposition sur un élément de réseau (7) pour les groupes Centrex IP. Selon l'invention, les paquets de données utiles reçus par un utilisateur (A, B) peuvent être redirigés vers le premier réseau de communication (1), dans l'unité de limitation de réseau (5), par commande au moyen d'informations de signalisation fournies, à l'aide d'une fonction de conversion d'adresse (awareNAT).
EP05796945A 2004-09-28 2005-09-27 Procede et dispositif pour commander un flux de donnees lors d'une communication entre des utilisateurs de centrex ip Withdrawn EP1794990A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05796945A EP1794990A1 (fr) 2004-09-28 2005-09-27 Procede et dispositif pour commander un flux de donnees lors d'une communication entre des utilisateurs de centrex ip

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP04023024A EP1641221A1 (fr) 2004-09-28 2004-09-28 Procédé et dispositif pour contrôler le flux de données d'une communication entre des abonnées d'un service Centrex IP
EP05796945A EP1794990A1 (fr) 2004-09-28 2005-09-27 Procede et dispositif pour commander un flux de donnees lors d'une communication entre des utilisateurs de centrex ip
PCT/EP2005/054849 WO2006035029A1 (fr) 2004-09-28 2005-09-27 Procede et dispositif pour commander un flux de donnees lors d'une communication entre des utilisateurs de centrex ip

Publications (1)

Publication Number Publication Date
EP1794990A1 true EP1794990A1 (fr) 2007-06-13

Family

ID=34926746

Family Applications (2)

Application Number Title Priority Date Filing Date
EP04023024A Withdrawn EP1641221A1 (fr) 2004-09-28 2004-09-28 Procédé et dispositif pour contrôler le flux de données d'une communication entre des abonnées d'un service Centrex IP
EP05796945A Withdrawn EP1794990A1 (fr) 2004-09-28 2005-09-27 Procede et dispositif pour commander un flux de donnees lors d'une communication entre des utilisateurs de centrex ip

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP04023024A Withdrawn EP1641221A1 (fr) 2004-09-28 2004-09-28 Procédé et dispositif pour contrôler le flux de données d'une communication entre des abonnées d'un service Centrex IP

Country Status (3)

Country Link
EP (2) EP1641221A1 (fr)
CN (1) CN101032152A (fr)
WO (1) WO2006035029A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7729344B2 (en) * 2006-12-29 2010-06-01 Genband Inc. Methods and apparatus for controlling signaling associated with a private branch exchange within a session over internet protocol network
CN102143406B (zh) * 2011-03-31 2015-01-28 大唐电信（天津）技术服务有限公司 一种集团交换机广域centrex业务网及广域centrex功能的实现方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2001237590A1 (en) * 2000-03-31 2001-10-15 British Telecommunications Public Limited Compagny Mobile data routing
US20040047340A1 (en) * 2002-07-16 2004-03-11 Hanspeter Ruckstuhl Method for address conversion in packet networks, control element and address converter for communication networks

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006035029A1 *

Also Published As

Publication number Publication date
WO2006035029A1 (fr) 2006-04-06
EP1641221A1 (fr) 2006-03-29
CN101032152A (zh) 2007-09-05

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