Remote Extensions dropping calls with 32 seconds - but only when port 5060 is forwarded

[Stewart1 (Stewart)]

PJSIP transports now configurable with external_signaling_port

Here is a recent feature request from phil https://issues.freepbx.org/browse/FREEPBX-23656 With recent versions of core and sipsettings modules in fpbx 15 and 16, it is now possible to define an external sip signaling port which differs from the internal signaling port for each pjsip transport. The value of this is for PBXs behind a NAT router when there is a necessity to port forward for sip signaling. Setting the external port to a high random number, while not a security precaution in and o…

If that’s not your issue, please provide details:
Are the external extensions pjsip or chan_sip? Is the other driver also in use? Is the title of your post backwards?