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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 …
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 ... break SIP. Just disable it, should work immediately.
SonicWall SIP settings - Binary Telecom
http://www.binarytelecom.com/SonicWallSIP.htm
Here are the SIP settings for SonicWall Firewalls. One-way audio becomes a frequent issue if not properly set. Some SonicWalls use 'Enforced Client Anti-Virus' from McAfee. If a device attempts to reach the internet, it insists that the device download and install the McAfee client software.
nat - SIP Trunk for VOIP behind a SonicWALL - Server Fault
https://serverfault.com/questions/672840/sip-trunk-for-voip-behind-a-sonicwall
Make sure it support sip alg and make sure you are using standard sip port (5060) or change the sip alg to "monitor" the sip port you are using. The rason for one way audio is because the firewall/router dosent know where to send the incoming udp messages/audio and thats why its getting dropped.
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