March 20, 2020, 4:35pm
Freepbx: 126.96.36.199, asterisk 13.29, with pjsip and behind NAT
Sip and RTP ports open/forwarded in the firewall to the PBX
Direct Calls, inbound and outbound, are working file.
but when inbound call is forwarded (*72) to an external number: phone is ringing but no audio
help would be appreciated.
March 21, 2020, 12:19pm
This is usually a symptom of not forwarding the full RTP range, so double check that router rule, it’s not working for you. You can bandaid by answering the channel on the inbound route, or by adding progressinband if using chan_sip.
March 21, 2020, 2:24pm
The answer has the effect of sending RTP out from the PBX before the call gets forwarded. I still maintain that your router forwarding for RTP is not working.
March 21, 2020, 5:09pm
Indeed, you are right.
A part of the port range was in overlapping with another rule and routed to the wrong server.
Thanks for you quick help.
March 28, 2020, 5:09pm
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