> 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/sip-and-voip/tucl.md).

# TUCL

TelcoBridges' [SIP](https://telcobridges.com/learning/sip-trunking/what-is-sip/) implementation works on top of several layers, including SIP and TUCL. TUCL stands for TCP/UDP Convergence Layer. TUCL offers TCP/IP and UDP/IP services to TelcoBridges' SIP stack. TUCL virtualizes physical Ethernet interfaces, making them globally accessible within the TelcoBridges' system.

In the following figure, grey boxes represent entities that need allocation on the TelcoBridges equipment. The TUCL layer is a transport layer used by SIP on our architecture. TUCL presents some advantages over a simple TCP/IP stack; for instance, it adds tracing facilities to any virtual interface.

![TB SIP Architecture](https://docs.telcobridges.com/w/images/0/0f/TB-SIP-Architecture.jpg)

### Features

TUCL adds the following functionality to SIP:

* Provides seamless access to any Ethernet interface on any TelcoBridges device ([Tmedia](https://telcobridges.com/media-gateways/products/tmedia-gateways/), [Tdev](https://telcobridges.com/products/development-platforms-tdev/))
* Enables SIP to create Ethernet IP aliases (virtual IP).
* Tracing of packets to/from Ethernet interfaces.
* Eventually, will offer Ethernet redundancy.


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