Comments
Yes in general SIP for Telephones (SIP-T), as defined in RFC 3372 (Session Initiation Protocol for Telephones (SIP-T): Context and Architectures), is a specification that defines how to interwork SIP with PSTN. The SIP-T specification does not define any new SIP extension, but uses the existing extension (such as PRACK, INFO, and so on) and other advanced SIP features (such as Multipart MIME and 183 response request) to translate ISDN user part (ISUP) and SIP messages, and in some cases, the tunnel ISUP in SIP.
The SIP stack provides all the necessary building blocks required by an application to
be compliant with SIP-T, for example, soft switches and PSTN gateways.
Posted by HamidAliKhan
SIP-T (SIP for Telephones) is another SIP extension. The goal of SIP-T is to make the trip through the SIP network look transparent to the ISUP endpoints and other PSTN network endpoints.
New Terms
Originator The MGC requesting a call session be built to complete a telephone call. This would be an MGC on the calling partys PSTN network
Terminator The MGC receiving the request and providing responses. This would be an MGC on the called partys PSTN network
SIP Bridging When a SIP network connects two segments of the PSTN
Adherence to SIP-T preserves ISUP information across the SIP network that can be used for
Protocol Analysis
Call Detail Reporting (CDR)
Call Trace, Analysis
Billing Report for Network Supervision and Management
References:
http://www.IETF.org, RFC 3372
http://www.atm.tut.fi/list-archive/ietf-announce/msg02884.html
draft-vemuri-sip-t-context-02.txt
Note- The IETF workgroup is now extending the protocol. Doug Hurtig of genband has been a contributor.
Posted by yogendra
SIP for Telephones (SIP-T), as defined in RFC 3372 (Session Initiation Protocol for Telephones (SIP-T): Context and Architectures), is a specification that defines how to interwork SIP with PSTN. The SIP-T specification does not define any new SIP extension, but uses the existing extension (such as PRACK, INFO, and so on) and other advanced SIP features (such as Multipart MIME and 183 response request) to translate ISDN user part (ISUP) and SIP messages, and in some cases, the tunnel ISUP in SIP.
The SIP stack provides all the necessary building blocks required by an application to
be compliant with SIP-T, for example, soft switches and PSTN gateways.
Posted by sagitraz
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