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How to troubleshoot one-way / no audio issues - Cisco ...
https://community.cisco.com/t5/collaboration-voice-and-video/how-to-troubleshoot-one-way-no-audio-issues/ta-p/3164442
A one-way audio call is when you have a call between 2 phones (internal-internal or internal-external), and one of them cannot hear the other …
How to troubleshoot one-way and no-way audio on VoIP …
http://info.teledynamics.com/blog/how-to-troubleshoot-one-way-and-no-way-audio-on-voip-calls
The vast majority of one-way or no-way audio problems are a result of the blockage of RTP ports for the voice stream. There may be many reasons why these ports would be blocked. Some of the most common are: (1) Network Address Translation (NAT)
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
One of the most common challenges involves a technology called Network Address Translation (NAT), which for data networks has been a godsend, but if not configured carefully, could cause problems for voice applications. In particular, NAT is a common cause of one-way and no-way audio on VoIP calls.
One way audio with Microsoft Direct Routing with ...
https://www.ucguys.com/2018/08/one-way-audio-with-microsoft-direct-routing-with-audiocodes-mediant-sbc-when-using-a-nat.html
One way audio with Microsoft Direct Routing with AudioCodes Mediant SBC when using a NAT. ... m=audio 16220 RTP/SAVP 0 76 77 8 18 101. ... Navigate to IP Network / Core Entities / NAT Translation and click on New. You will need to select the source interface for which the SBC talks with the Microsoft SIP Proxies.
The causes of No-Audio and One-Way-Audio VoIP Calls ...
https://blog.kolmisoft.com/the-causes-of-no-audio-and-one-way-audio-voip-calls/
Some SBC/Softswitches do not accept audio from an RTP port range greater than 50,000. The safe zone is 10,000–50,000. Some SBC/Softswitches ignore IP:PORT in SDP, and send media back to the IP:PORT from where the SIP message was received. Conclusion. As you can see, there are a number of possible causes of a no-audio or one-way audio problem.
How to solve VoIP one way audio- step by step.
https://www.voipmechanic.com/voip-one-way-audio.htm
One way audio can be caused by network issues; NAT (Network Address Translation) issues or firewalls, so finding the cause will require simplification of the connection by elimination of some equipment, then testing. Once the problem device is found its pretty much initiating changes that resolve the issue.
Correcting One-way Audio with a VoIP Call - Asterisk
https://www.asteriskpbxsystems.com/troubleshoot-oneway-audio.html
Fixing one-way audio issues in VoIP are best done one step at a time. Start by eliminating any double NAT possibilities by disabling NAT on any secondary routers that may be present on the LAN. This should be considered good basic LAN network design anyway and multiple instances of NAT will cause problems both in VoIP and elsewhere.
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