> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/telecom-references/protocols/sip-i-sip-t.md).

# SIP-I/SIP-T

Session Initiation Protocol with encapsulated ISUP, which is known as SIP-I, specifies the criteria for enabling ISUP networks to work with SIP networks. SIP-I is an extension to an existing SIP protocol and transports ISUP specific messages over a SIP network.

### Supported SIP-I Specification

TelcoBridges supports the Profile C (SIP-I) of [ITU Q.1912.5](http://www.itu.int/itudoc/itu-t/aap/sg11aap/history/q1912.5/index.html).

*The following items are not supported:*

* *Precondition (RFC3312)*
* *SIP-I digit overlap*
* *SUS/RES ISUP message to SIP INFO message*

### TelcoBridges and SIP-I

ISUP variant supported :

* ANSI-88
* ANSI-92
* ANSI-95
* TELCORDIA
* ITU
* ITU97
* SINGAPORE
* Q767
* NTT
* CHINA
* ETSI
* ETSIV3
* UK
* SPIROU

SIP-I support starts from release 2.6.23. Please refer to [TMG-CONTROL version 2.6](https://github.com/telcobridges-main/tmedia-wiki/tree/main/tmedia/legacy/tctrl-version-2-6/README.md)

### Configuration

* SIP-I is enabled on a per-[NAP](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/nap/README.md) basis.
* [Tmedia v3.2: SIP Advanced Features](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/sip-voip/enabling-sip-i-sip-t/README.md)
* [Tmedia v3.0: SIP Advanced Features](https://github.com/telcobridges-main/tmedia-wiki/tree/main/tmedia/configuration/tmedia-tdev-and-tsig-web-portal-3-0-protocol-stacks/README.md#sip-advanced-features)

\- \[Tmedia v2.10: SIP Advanced Features]\(/tmedia/configuration/tmedia-tdev-and-tsig-web-portal-2-10-protocol-stacks#sip-advanced-features) - \[Tmedia v2.9: SIP Advanced Features]\(/tmedia/configuration/web-portal-2-9-protocol-stacks#sip-advanced-features) - \[Tmedia v2.8: SIP Advanced Features]\(/tmedia/configuration/web-portal-2-8-protocol-stacks#sip-advanced-features) - \[Toolpack v2.7: SIP Advanced Features]\(/tmedia/configuration/tmedia-tsig-and-tdev-web-portal-2-7-tutorial-guide#sip-advanced-features) - \[Toolpack v2.6: SIP Advanced Features]\(/tmedia/configuration/tmedia-tsig-and-tdev-web-portal-2-7-tutorial-guide#sip-advanced-features)

### External Sources

* [ITU Q.1912.5](http://www.itu.int/itudoc/itu-t/aap/sg11aap/history/q1912.5/index.html) *Interworking between SIP and BICC/ISUP*


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