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

# SIP-I/SIP-T

SIP-I and SIP-T, SIP with encapsulated ISUP for interworking SS7 and SIP networks. TelcoBridges supports ITU Q.1912.5 Profile C, with listed exceptions.

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

### Configuration

* SIP-I is enabled on a per-[NAP](/telecom-references/sip-and-voip/sip/nap.md) basis.
* [Tmedia v3.2: SIP Advanced Features](https://tmediadocs.telcobridges.com/configuration/web-portal-3-3/protocol-stack/sip/enabling-sip-i-sip-t)
* [Tmedia v3.0: SIP Advanced Features](https://tmediadocs.telcobridges.com/other-pages/protocol-stacks-general/tmedia-tdev-and-tsig-web-portal-3-0-protocol-stacks)

<details>

<summary>Click here for other versions</summary>

* [Tmedia v2.10: SIP Advanced Features](https://tmediadocs.telcobridges.com/configuration/web-portal-previous/web-portal-2-10/tmedia-tdev-and-tsig-web-portal-2-10-protocol-stacks)
* [Tmedia v2.9: SIP Advanced Features](https://tmediadocs.telcobridges.com/configuration/web-portal-previous/web-portal-2-9/web-portal-2-9-protocol-stacks)
* Tmedia v2.8 and earlier: documentation is no longer published. Contact [technical support](https://tmediadocs.telcobridges.com/operations-and-support/support/contacting-telcobridges-technical-support) if you need it.

</details>

### 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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