> 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/tmedia-documentation/platforms-and-hardware/tdev-signaling-protocols.md).

# Tdev Signaling Protocols

Signaling refers to the system of messages required to set up and tear down telephone calls between the calling and the called parties.

### TelcoBridges and signaling protocols

TelcoBridges provides support for the following signaling protocols:

* **PSTN**
  * [SS7](https://telcobridges.com/media-gateways/solutions/signaling/migrating-ss7-sigtran/)
    * (20+ variants) [MTP2](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/mtp2/README.md), [MTP3](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/mtp3/README.md), SS7/C7 [TCAP](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/tcap/README.md) and [ISUP](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/isup/README.md)
  * [ISDN](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/isdn/README.md) PRI
    * (14+ variants), National ISDN-2, Euro ISDN, DMS100, DMS250, 4ESS, 5ESS, Japan INS-NET1500
  * [CAS](https://github.com/telcobridges-main/tmedia-wiki/tree/main/reference/protocols/cas/README.md) (multiple variants):
    * MF-R1, MFC-R2, Loop Start, Ground Start, Wink Start, Robbed-bit signaling
* **IP**
  * [SIP](https://telcobridges.com/learning/sip-trunking/what-is-sip/) RFC 3261 User Agent, SIP Authentication
  * [SIGTRAN](https://telcobridges.com/media-gateways/solutions/signaling/migrating-ss7-sigtran/)

**Important Notes**

* TelcoBridges' Tdev devices also offer the conversion of signaling messages between nodes that use different signaling protocols.
* All supported protocols can be used simultaneously with the same device.


---

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