When using SIP protocol one way or missing auido issues mostly appear due to configuration problems. The issues usually appear if the configuration is not adjusted accordingly to the wireless or 3g/4g network.
By default pfSense® software rewrites the source port on all outbound traffic. This is necessary for proper NAT in some circumstances such as having multiple SIP phones behind a single public IP registering to a single external PBX. With a minority of providers, rewriting the source port of RTP can cause one way audio. Audio broadcast. One-way audio, for meetings where attendees only listen. A host speaks by using a microphone connected to their computer. √ Integrated Voice-over-IP (VoIP) Audio. Instead of using a telephone, use a computer to send the audio over the Internet. √ √ √ √ Other Teleconference Service. Use a third-party teleconference Nov 18, 2016 · Over the past two months we have worked with the VoIP vendor to troubleshoot the issue and our latest test involved using another hardware vendor's end points where the one-way audio did not show up even in extremely high call volumes. VoIP call issues over site-to-site VPN or with IPS configured. Resolve issues with VoIP call quality when there is a site-to-site VPN or IPS configured on XG Firewall. Audio and video calls are dropping or only work one way when H.323 helper module is loaded. Resolve audio and video issues when the H.323 module is loaded. If it was a codec issue, you'd have no audio, because the phones would be unable to send audio between each other. One way audio is almost always caused by RTP not passing through. Per DLux's statement, turning off SIP ALG or SIP Fixup or SIP Transformation - different routers use different terms for the same thing - is a good first step.
Audio broadcast. One-way audio, for meetings where attendees only listen. A host speaks by using a microphone connected to their computer. √ Integrated Voice-over-IP (VoIP) Audio. Instead of using a telephone, use a computer to send the audio over the Internet. √ √ √ √ Other Teleconference Service. Use a third-party teleconference
Forum discussion: I'm having an interesting one-way audio problem with Mitel 6867i phones behind a Tomato router. The problem only occurs with calls between phones on the same subnet. Calls to and After running a wireshark capture while the one-way audio issue is happening, it appears that on the users' machines, XLIte is sending the outbound packets to their network adapter (gets lost), and the inbound packets are coming through the VPN virtual adapter (can hear audio).
This enables an external source to reach a port inside the private LAN from the outside through a NAT-enabled router and can solve many instances of one-way audio. For VoIP connections, opening specific ports for traffic, allows two-way communications accessible regardless which side initiates the call.
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