I have 4 Polycom phones behind a firewall. I cannot get them to dial as is says “URL Disabled” so its not registered to my server.

I have tried nat=no, nat=force_rport,comedia still no go.

I have sip.conf set for bindaddr= my server IP.

I have uncommented the localnet2.168.1.0/255.255.255.0 in sip.conf

How do I tell what its NOT liking and which setting to change. I have restarted asterisk each time and or rebooted the phone.

This seems like it is doing the right thing.
(I changed the IP addresses below…)
<--- Transmitting (NAT) to 12.215.99.135:55048 --->
SIP/2.0 401 Unauthorized Via: SIP/2.0/UDP 12.215.99.135:55048
;branch=z9hG4bK9420189357AB69A0;received.215.99.135;rportU048
From: “524” ;tag