After 15.5 update 6, phone systems lose all audio

[nsymphony]

After the recent .6 update on a couple of phone systems, I'm having issues where no audio on either end of the call is happening. Regardless if it's extension to extension a desk apart, or an external call, it's just dead air. The only way I have found to 'fix' the problem is to reboot the server, restarting services will not fix it. I've checked the event log and there isn't anything showing when the issue occurs. Additionally, prior to the .6 update everything was rock solid. Is anyone else having this issue? The exact version we are are seeing this on is 15.5.15502.6. It's happening on two separate systems thus far...

 

[YiannisH_3CX]

Now we know 3CX Phone client uses 40000-65536 (25,536 ports). Is this configurable?

Currently this is not configurable.

Most simple networks will not have an internal firewall. If you do have one, my understanding now is that you want to open UDP traffic FROM the computers running 3CX Phone TO the PBX ports 7000-8499. The FROM side rule can be "from any port" or it can be restricted to "from 40000-65536". Correct?

That is correct. Any rules for local ports should be done based on the UDP ports of the 3CX server.

 

[YiannisH_3CX]

@YiannisH_3CX any chance we can have a sticky on this subject - it keeps coming up over and over.

I will suggest this and see if it is possible.