Has anyone faced one-way audio issues in Asterisk after a network or firewall change?
We recently diagnosed a case where SIP signaling worked perfectly (calls connected), but RTP audio failed in one direction. The root cause turned out to be incorrect localnet/externip settings and NAT behavior after a subnet update.
We also verified RTP port range, firewall rules, and symmetric RTP settings.
What has been the most common cause of one-way audio in your deployments?