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No Sound on External SIP in Asterisk|FreePBX
https://www.sysfix.co.uk/Blog/No-sound-on-external-sip-asterisk.html#:~:text=No%20sound%20with%20SIP%20%7C%20No%20Sound%20With,or%20TrixBox%29-%20They%20all%20use%20the%20same%20format
No audio on Asterisk SIP call - Stack Overflow
https://stackoverflow.com/questions/5554837/no-audio-on-asterisk-sip-call
2) Not answered calls: in your dialplan (/etc/asterisk/extensions.conf) you need to answer calls before they can send any audio (RTP), make sure every call runs through an Answer(). 3) Multiple answers in a single call: a call can be answered only a single time, in some asterisk versions you won't receive audio if a call is answered twice or more times so make sure you don't.
Solution to the Asterisk problem – no sound when calling ...
https://ixnfo.com/en/solution-to-the-asterisk-problem-no-sound-when-calling-via-nat.html
Solution to the Asterisk problem – no sound when calling via NAT Posted by Vyacheslav 16.10.2017 06.04.2020 Leave a comment on Solution to the Asterisk problem – no sound when calling via NAT I noticed recently that there is no sound when calling from IP-phone to another IP-phone which were both behind the same NAT (router).
No Sound on External SIP in Asterisk|FreePBX
https://www.sysfix.co.uk/Blog/No-sound-on-external-sip-asterisk.html
SIP One Way Audio Troubleshooting. Once these ports have been forwarded to the IP of your Asterisk server, give your router a reboot. Re-Login to your router just to reconfirm that the posts are in fact pointing to the correct IP of the Asterisk Server. The next step is to ensure that you configure your NAT settings on the Asterisk server correctly.
No audio - Fresh install - Asterisk SIP - Asterisk Community
https://community.asterisk.org/t/no-audio-fresh-install/83257
If the endpoint is behind NAT and Asterisk is not configured to know the endpoint is behind NAT, then you will see no audio and can have other places. The options to set to yes would be “rewrite_contact”, “rtp_symmetric”, and “force_rport” if the endpoint itself is behind NAT.
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