# Glossary: SIP-I/SIP-T

Session Initiation Protocol with encapsulated ISUP, which is known as SIP-I, specifies the criteria for enabling SS7 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).<br>

### TelcoBridges and SIP-I

ISUP variant supported :

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

### Configuration

* SIP-I is enabled on a per-[NAP](/appendices/appendix-a-glossary/glossary-nap.md) basis.
* [SIP-I configuration](https://docs.prosbc.com/configuration-details/configuration-by-web-portal-category/sip/enabling-sip-i-sip-t)

### 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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