# 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.

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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:

<figure><img src="https://docs.telcobridges.com/w/images/e/e4/SIP_trunk_registration.png" alt=""><figcaption></figcaption></figure>

### 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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