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Calls forwarded outbound via SIP trunks connect but no audio
https://www.tek-tips.com/viewthread.cfm?qid=1767037#:~:text=Forwarding%20a%20call%20coming%20into%20the%20SIP%20trunks,trunks%20to%20a%20SIP%20extension%20works%20just%20fine.
No Audio or One-audio - SIP Incoming Call Forwarding to ...
https://support.yeastar.com/hc/en-us/articles/360038834294-No-Audio-or-One-audio-SIP-Incoming-Call-Forwarding-to-External-Number-via-SIP-trunk
Without the RTP(CN), it is not able to activate the NAT session which leads to the no voice issue in this case. Solutions. Choose either one according to your environment: 1. Enable the RTP Keep-alive option for the SIP …
Calls forwarded outbound via SIP trunks connect but no audio
https://www.tek-tips.com/viewthread.cfm?qid=1767037
Forwarding a call coming into the SIP trunks and then back out the SIP trunks results in no audio. The call rings on the far-end, and can be answered, but there's no audio in either direction. A call inbound via SIP trunks to a SIP extension works just fine. (Using a softphone on my laptop registered via VPN during testing)
How to resolve one-way or no-way audio on VoIP calls
http://info.teledynamics.com/blog/how-to-resolve-one-way-or-no-way-audio-on-voip-calls
SIP functions using TCP or UDP ports 5060 and 5061. So, a simple and intuitive solution would be to allow ports 5060 and 5061 to be port-forwarded internally. In the following diagram, the external voice endpoint is attempting to communicate with the internal IP phone.
Disable SIP ALG and Forward NAT Ports to Stop Dropped …
https://www.onsip.com/voip-resources/voip-solutions/disable-sip-alg-and-forward-nat-ports-to-stop-dropped-calls
Enter the IP addresses of the device you wish to forward ports for (in this case, your VoIP phones). Enter "5060" for both the "Starting" and "Ending" ports to forward SIP traffic. Check "UDP" on each entry. Create a new forwarding entry for RTP. Make another port forwarding entry, starting at 10000 and ending at 10100.
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