I have an issue where I am using a DNS SRV as my server_uri for a SIP Trunk.
Asterisk is working correctly in resolving this, and registration is complete.
However when placing an outbound call, the INVITE has the TO set to @<server_url> - where my provider requires the realm to be set to a specific realm.
Thanks again… I’ll put it back in there court. I would have thought its a pretty big oversight from them - effectively implementing a restriction that prevents Asterisk from using there voice platform.