A client from us has some issues with incoming calls. Since a few weeks - beginning of September - when someone calls, it rings, pick up, but no audio. If the same callers calls again, it may work eventually. The issue only is for incoming calls randomly. No issue at all for outgoing calls.
The client has FreePBX for over 2 years installed, the issue started early September. We haven’t changed anything at the installation. Any chages to the infrastructure is not known for us.
I would like to ask the community for some ideas to troubleshoot the issue. My first thought was audio codecs. Could you also please tell me which FreePBX log file contains information about calls in detail… Used codec with negotiation phase.