I have the current setup: SIP client &lt;-&gt; SER Proxy &lt;-&gt; SIP Trunk.<br><br>My reason for the SER Proxy is that the SIP trunk only allows connections from approved IP addresses (such as my server with SER Proxy).<br>

<br>My user on the SIP Trunk has the following authentication username@domain.<br><br>I am able to register to the SIP Trunk as I&#39;m setting up my SIP klient with username to username, domain to domain and then add my SER Proxy IP address as proxy.<br>

<br>This works and means that I&#39;m able to place calls to the SIP Trunk.<br><br>BUT people cannot place calls from the SIP Trunk to my SIP client, due to the fact that on the SIP Trunk my locations is registered as username@SER-Procy-IP.<br>

<br>So when people are calling me, the SER Proxy is looking for username@SER-Procy-IP and NOT username@domain, as I&#39;m registered with. And then SER Proxy reports: 404 Not Found.<br><br>Can anyone help me how to set this up correctly? I do not have access to the SIP Trunk, but I have all access to the SIP client and SIP Proxy.<br>