# Glossary: Signaling protocols

### TelcoBridges and Signaling Protocols

TelcoBridges' products not only multiple signaling protocols but also provides mediation between different protocol vendors.

**SBC**

* IP
  * [SIP](https://prosbcdocs.telcobridges.com/configuration-details/configuration-by-web-portal-category/sip) RFC 3261 User Agent, SIP Authentication
    * Access to SIP headers
    * Extensive SIP header manipulation
    * SIP to SIP-I protocol conversion
    * [SIP registration forwarding](https://prosbcdocs.telcobridges.com/configuration-details/configuration-by-use-case/sip-registration-forwarding), [SIP subscribe/notify/publish forwarding](https://prosbcdocs.telcobridges.com/use-cases/applications/sip-subscribe-notify-publish-forwarding)
    * NAT traversal

***T*****media**

* PSTN
  * [SS7](https://docs.telcobridges.com/wiki/SS7)/C7
    * (20+ variants) [MTP2](https://docs.telcobridges.com/wiki/MTP2_Layer), [MTP3](https://docs.telcobridges.com/wiki/MTP3_Layer) and [ISUP](https://docs.telcobridges.com/wiki/ISUP)
  * [ISDN](https://prosbcdocs.telcobridges.com/hidden-pages/glossary-isdn) PRI
    * (14+ variants), National ISDN-2, Euro ISDN, DMS100, DMS250, 4ESS, 5ESS, Japan INS-NET1500, NET5 (France, Germany, UK, China, Hong Kong, Korea), NTT
  * [CAS](https://docs.telcobridges.com/wiki/CAS) (Script-oriented approach):
    * [CASR1](https://docs.telcobridges.com/wiki/CASr1_scripting):
      * [E\&M "Wink start" or "Delay start"](https://docs.telcobridges.com/wiki/CAS_R1_E%26M)
      * [Loop start](https://docs.telcobridges.com/wiki/CAS_R1_LOOPSTART_NETWORK) ([network side](https://docs.telcobridges.com/wiki/CAS_R1_LOOPSTART_NETWORK) and [user side](https://docs.telcobridges.com/wiki/CAS_R1_LOOPSTART_USER))
      * ground start
    * [CASR2](https://docs.telcobridges.com/wiki/CAS_R2_scripting):
      * Generic (ITU base specification)
      * Brazil
      * Mexico
      * Venezuela
  * [H.248](https://docs.telcobridges.com/wiki/H.248#H.248_package_support)
  * GR-303
    * The integration of the GR-303 protocol for Tmedia enables a seamless interoperability between GR-303 and SIP, as well as among different GR-303 connections.
* IP
  * [SIP](https://prosbcdocs.telcobridges.com/configuration-details/configuration-by-web-portal-category/sip) RFC 3261 User Agent, SIP Authentication
    * Access to SIP headers
    * Extensive SIP header manipulation
    * SIP to SIP-I protocol conversion
    * NAT traversal
  * [SIGTRAN](https://prosbcdocs.telcobridges.com/appendices/appendix-a-glossary/glossary-sip/glossary-sigtran)
    * [M2UA](https://docs.telcobridges.com/wiki/M2UA), [M2PA](https://docs.telcobridges.com/wiki/M2PA), [M3UA](https://docs.telcobridges.com/wiki/M3UA) and [IUA](https://docs.telcobridges.com/wiki/IUA)

### Important Notes

* TelcoBridges Tmedia devices also offer the conversion (transcoding) of signaling messages between nodes that use different signaling protocols. For more information about Transcoding options, see [TelcoBridges website.](https://www.telcobridges.com/solutions/transcoding)
* All supported protocols can be used simultaneously.