Hallo,
Which is RTP port range. I have seen one way audio with FritzBox ATA behinde router. When FritzBox is used als router then every thing is fine. I have used stun settings but even then there was one way audio- out going audio fine but no incomming on some calls.
I don't think that with STUN setting one need any sort of port forwarding. I don't have access to router where my FritzBox ATA is connected so can't do any port forwarding.
Regards.
Majo
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