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One way audio with VOIP - Spiceworks
https://community.spiceworks.com/topic/1836961-one-way-audio-with-voip
SonicWalls always do one way audio. Worst firewall for VoIP that we've ever seen. Something like 50% of all VoIP issues are SonicWall related. Look for SIP-ALG, SW turns it on by default and this is what it is designed to do …
Using a Sonicwall with VoIP
https://www.voipmechanic.com/sonicwall-voip.htm
The SonicWall does provide a "Consistent NAT" option to help resolve this issue, but this does not correct the fact that port numbers are actually changed. Changing outbound port numbers will cause issues with the VoIP traffic. These …
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