On a call one side cant hear the other randomely

Hello I inherited a system where the client says that randomly callers cant hear the other side. This happens between internal callers and exernal callers. What could be the issue. We do know that the Asterisk server is the proxy between the two connections.

Asterisk is a back to back user agent , not a proxy.

What do you have the RTP port range set to on Asterisk? What do you have it set to on the router.

also which version do you have and are you using chan_pjsip or chan_sip

try play with this for your endpoint






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