Detection of loops within a sip signalling proxy

A technology of session initiation protocol and loop detection, which is applied in wireless network protocols, wireless communication, digital transmission systems, etc., can solve problems such as blocking communication networks, and achieve the effect of reducing additional costs

Active Publication Date: 2007-12-19
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0033] With values ​​of this magnitude, the final result is a total of 27

Method used

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  • Detection of loops within a sip signalling proxy
  • Detection of loops within a sip signalling proxy

Examples

Experimental program
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Embodiment Construction

[0057] In a known manner, the SIP proxy can be divided functionally into a receiving means RCP, a processing means TRT and a sending means EMS.

[0058] The receiving means is the RCP, which receives the signaling message "me" originating from the communication network via the input interface of the SIP proxy.

[0059] These signaling messages "me" conform to the SIP protocol currently defined by IETF RFC 3261 and extensions that enrich this base protocol. Examples of extensions of the SIP protocol include RFC 3265 "Session Initiation Protocol (SIP)-Specific Event Notification", and RFC 3262 "Reliability of Provisional Responses in the Session Initiation Protocol (SIP)".

[0060] The receiving means RCP comprise a module SR for computing a signature from an input set of signaling message parameters.

[0061] This set of parameters is provided by RFC 3261. it includes:

[0062] - Flags of the "From" and "To" parameters, which identify the logical name of the sender and the d...

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Abstract

The element has a receiving unit (RCP) including a loop detecting mechanism that calculates a signature e.g. alphanumeric chain, from parameters e.g. route, of input signaling messages (me) and detects a loop by comparing the signature with values inserted in a particular parameter e.g. branch parameter, of the messages. The unit sends the message to a processing unit (TRT) when the loop is not detected. The unit (TRT) transmits output signaling messages (ms) to a transmitting unit (EMS) that inserts the signature in the particular parameter of the messages (ms) based on the messages (me). The parameters conform to draft-ietf-sip-fork-loop-fix-04.txt. An INDEPENDENT CLAIM is also included for a method of transmitting a signaling message to a proxy session initiation protocol signaling intermediate element.

Description

technical field [0001] The present invention relates to signaling to establish multimedia conferences over packet communication networks, and more particularly to the use of the SIP (Session Initiation Protocol) protocol over such networks. [0002] A particular application of the invention is in IMS (IP Multimedia Subsystem) type network architectures, as defined by the 3GPP and TiSpan standards organizations, which propose the SIP protocol as the only signaling protocol. Background technique [0003] This SIP protocol is described in RFC 3261 published by IETF (Internet Engineering Task Force). Its purpose is to enable the establishment and control (modification, termination, etc.) of multimedia sessions on packet communication networks operating with the IP (Internet Protocol) protocol stack. It enables two parties in a multimedia session to authenticate each other, determine each other's location, and possibly negotiate the types of media available for transmission in t...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L12/56
CPCH04L29/06312H04L65/1016H04L65/1063H04L29/06217H04L29/06197H04L65/105H04L65/1006H04L29/06027H04L29/06285H04L65/1045H04L65/1104H04W80/10H04L65/1101
Inventor T·弗罗门特C·勒贝尔
Owner ALCATEL LUCENT SAS
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