I’ve set up a sip trunk between two freeswitches. On freeswitch A I’ve configured a gateway <gateway name="testgw2"> <param name="username" value="toni"/> <param name="password" value="toni456"/> <param name="proxy" value="192.168.1.135"/> <param name="register" value="true"/> <param name="caller-id-in-from" value="true"/> </gateway> on freeswitch B I’ve configured a user appropriate to the gateway <include> <user id="toni"> <params> <param name="password" value="toni456"/> <param name="vm-password" value="1000"/> </params> <variables> </variables> </user> </include> To call from freeswitch A to freeswitch B I've configured the following dialplan <extension name="test"> <condition field="destination_number" expression="^(12345)$"> <action application="bridge" data="user/toni"/> </condition> </extension> Now my question. However freeswitch A is registered to freeswitch B with the gateway user, I get a "Proxy Authentication Required" SIP message as response to an invite. This is because I have set the parameter „auth_calls" in the sip profile to true. Is there a way to configure the sip profile or gateway to accept calls only from this gateway? If I change the parameter „auth_calls“ to „false“, I do not get the "Proxy Authentication Required“ message, but then all calls received on this profile do not need authentication. Thanks Markus