I’m trying to configure IP501s on a WAN through two firewalls. I’ve given up on NAT for now and just using static IPs. I’m not able to get the phones to register.
I’ve tried numerous sip.conf versions always with the same result:
WARNING: chan_sip.c:694 retrans_pkt: Maximum retries exceeded on call
This must be because the phones and Asterisk are not yet communicating.
The firewalls are open for communication between the Asterisk server IP and the static phone IPs, port 5060 TCP & UDP , no NAT.
Can someone please post a working sip.conf similar to this scenario, or any other hints would be greatly appreciated.