This is a home/office FreePBX 22.214.171.124 running in a HVVM sitting behind a Zyxel vDSL router SBG3300 (latest FW)
Sipgate-basic was working fine for years until the last few month. Every three weeks or so the trunk fails to register.
FreePBX power cycle does not fix it.
FreePBX firewall is off
Router QoS is off
Router SIP ALG is disabled
If I setup a softphone to connect directly to Sipgate it does register immediately
It seems that rebooting the router resolve the issue.
Why is FreePBX failing and PhoteLite registering?
Why a router reboot fixes it for a while?
How do I configure FreePBX/Zyxel to eliminate the problem?