I’ve got an Asterisk system (10.4.0) setup that will randomly experience one-way audio. It doesn’t seem to happen with any consistency on a particular phone or service and when it happens while leaving a voicemail the message can’t be left (no audio from speaker error). It’s behind a static IP address forwarded from our router and there seems to be no obvious configuration issues. When it happens there are no obvious signs in either the Asterisk Console or in the /var/log/asterisk/messages log.
Any tips on troubleshooting this issue?