> 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/configuration/web-portal-3-3/protocol-stack/sip/configuring-sip-authentication.md).

# Configuring SIP Authentication

> **Applies to:** Tmedia 3.0, 3.2, 3.3

**Important**

Follow this procedure if you require the Tmedia to answer the SIP INVITE/BYE authentication challenge messages (ie. interconnect a SIP with a TDM network). If you need those challenge messages to be forwarded, do not follow this procedure. This procedure assumes that your SIP NAP is already configured.

You need to edit the SIP [NAP](https://prosbcdocs.telcobridges.com/telecom-references/sip-and-voip/sip/nap) and configure the SIP realm.

To Access your SIP NAP Configuration:

1- Click **NAPs** in the navigation panel

![Sip Nap 0](https://docs.telcobridges.com/w/images/b/ba/Sip_Nap_0.png)

2- Select a SIP NAP from the **Network Access Point List**

![EnableSipISipT 1](https://docs.telcobridges.com/w/images/e/e2/EnableSipISipT_1.png)

3- Expand the **Authentication Parameters** section

![ExpandNAPAuthenticationParametersSection 1](https://docs.telcobridges.com/w/images/0/0a/ExpandNAPAuthenticationParametersSection_1.png)

4- Fill the Realm information

* Set the SIP authentication Realm
* Set authentication user
* Set authentication password ![FillNAPAuthenticationRealm 1](https://docs.telcobridges.com/w/images/5/5f/FillNAPAuthenticationRealm_1.png)

5- Click Save

#### Reference

* [SIP Authentication](https://prosbcdocs.telcobridges.com/telecom-references/sip-and-voip/sip/sip-authentication)


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