The phones will register and make and receive calls, but after 5 minutes they all go offline. A reboot of the server solves it, but only for another 5 minutes. The phones are Cisco 7960’s that worked on an old version of FreePBX. Not sure what setting to look at for this issue. They are using chan_sip on port 5060. There is no NAT and both sides are programmed to no.
Asterisk then shows this when the phone goes offline: NOTICE[2700]: chan_sip.c:30136 sip_poke_noanswer: Peer ‘1010’ is now UNREACHABLE! Last qualify: 0
After letting it run for awhile they register every 30 mins for around 5 mins. I turned off qualify and that did not help. DNS is set correctly as well.
Fix: Intrusion Detection turned off.