Random no audio on calls?

[James80]

Aloha!

I'm having problems for the last 2 days. Randomly, there are times when an external call audio is either one way (only remote person can hear, 3cx user can't hear anything) or neither party can hear.

I have run the firewall checker and it's all good there. I have tried everything I can think of..

I have no idea when it's going to happen (only happened once today) so it's near impossible to try to capture the data using wireshark...

There was no changes on the firewall or trunk provider.

The system is on Windows 10 Pro VM.

 

[Mark Phillips]

My experience of this issue is usually a firewall going into DoS defence mode - which ends up blocking the legitimate UDP RTP packets. It happens about once every 90 days on one of our sites, and a firewall restart cures it every time - for another 90 days. I'm putting my issue down to dodgy firewall firmware, as it doesn't happen on another site with a different firewall.

 

[James80]

Thank you, I just updated my firewall and rebooted my network this morning so we'll see how it goes once the rest of the staff come in and we start receiving calls...