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What Causes VoIP One-Way Audio? - PathSolutions
https://www.pathsolutions.com/resources/what-causes-voip-one-way-audio/#:~:text=One-way%20audio%20in%20a%20VoIP%20environment%20can%20be,one-way%20audio%2C%20listed%20in%20priority%20order%3A%20Firewall%20misconfiguration.
Solved: Intermittent VOIP One Way Audio - Check Point ...
https://community.checkpoint.com/t5/General-Topics/Intermittent-VOIP-One-Way-Audio/td-p/75168
We inspect SIP control packets and decide what ip/port should be opened for every call. From the look on your problem it seems to be related to NAT not being done properly on the payload, that's usually the root cause for one-way audio. More than that, if RTP matches the rulebase instead of being open dynamically, it won't be NATted correctly.
[SOLVED] Intermittent one way audio with VoIP - double NAT ...
https://community.spiceworks.com/topic/1469500-intermittent-one-way-audio-with-voip-double-nat-issue-possibly
I am running into a very frustrating issue with one way audio very intermittently on some calls. 99% of calls work fine but now and again I am experiencing one way audio - this can be both ways. I've taken this up with my VoIP provider and then have asked for a WAN side capture, which due to my setup I am unable to provide.
How to solve VoIP one way audio- step by step.
https://www.voipmechanic.com/voip-one-way-audio.htm
Solve One Way Audio-Step by Step. One way audio where one side or one party can hear the other, but not reverse, is typically indicative of something stopping either the outbound or inbound audio from reaching the receiving party. One way audio can be caused by network issues; NAT (Network Address Translation) issues or firewalls, so finding the cause will require …
What Causes VoIP One-Way Audio? - PathSolutions
https://www.pathsolutions.com/resources/what-causes-voip-one-way-audio/
One-way audio in a VoIP environment can be frustrating, as one caller can hear everything fine, but the other caller hears nothing. One-way audio can occur at the beginning of a call, or mid-way through an existing call. Here are the causes of one-way audio, listed in priority order: Firewall misconfiguration.
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)
Intermittent one way voice - Cisco Community
https://community.cisco.com/t5/ip-telephony-and-phones/intermittent-one-way-voice/td-p/2471495
Users are complaining that there are one way voice sometime and it is quite random and intermittent. Most of the times it is fine but sometime there are issues when the caller is not being able to hear but the called person is able to hear. The strange thing is that if Site A calls Site B then Site A is not able to hear but site B can hear; again if site B calls then the …
Solved - Intermittent one way audio - fixed with server ...
https://www.3cx.com/community/threads/intermittent-one-way-audio-fixed-with-server-restart.62671/
One way audio is predominately a network issue - for example SIP ALG or ports blocked on your network firewall. As this does not happen all the time this may not be the root cause, but it would be worth running the firewall checker on 3CX to see if it all checks out.
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