> 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/other-pages/protocol-stacks-sip/configuring-sip-registration-to-sip-proxy.md).

# Configuring SIP Registration to SIP Proxy

### SIP Registration to SIP Proxy Overview

Telcobridges supports registering a SIP NAP to a SIP proxy.

* Registration authenticates TelcoBridges product's IP address with a SIP provider proxy or SBC and this will allow SIP traffic from the Telcobridges product to pass through to that SIP provider.
* Registering with a SIP provider from Tmedia/ProSBC will always take place over SIP trunk.
* SIP trunking enables the end point’s PBX (Private Branch Exchange phone system), Telcobridges product such as Tmedia or ProSBC, to send and receive calls via the Internet.

You must configure SIP Registration with a SIP Proxy (a SIP provider/ITSP) on Telcobridges product if it is required for the reasons mentioned above.

SIP registration to SIP Proxy (NAP) can be configured in the NAP editing page:

![SIP trunk registration](https://docs.telcobridges.com/w/images/e/e4/SIP_trunk_registration.png)

### Setting SIP Registration to SIP Proxy in NAP configuration

* Two required sections to set are: Registration Parameters, Authentication Parameters
* Registration Parameters: need to obtain the address to register from SIP Proxy/SIP provider
* Authentication Parameters: check ignore realm use, username, and password. In addition, specify the Realm by obtaining this information from the SIP Proxy/SIP provider.

### References

* [Wikipedia SIP trunking article](https://en.wikipedia.org/wiki/SIP_trunking)


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