after we managed to rule out all basic one way audio issues (native bridging, codec allow/disallow, NAT problems), a new and very intermittent one way issue has just occured. Persons who make 10-20 phone calls a day have not complained yet, but those using the phone more heavily suffer from it.
It is not a matter of calling / called party, but just of inside phone vs remote phone.
When the problem comes up, the remote person can hear our folks talk, but we cannot hear the remote person.
This only occurs after some time, one minute or more.
Anyone ever had such an issue? The problem in packet inspection would be that I can capture one or two whole days without a single incident. So I’d like to check anything possible before going this last step.
By the way: Asterisk 1.6 on LAN together with Snom 320 phones; SIP via sipgate.de using a Vigor draytek router with no explicit VoIP QoS settings