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When I install 220.127.116.11-89n release on my TZ300, VOIP calls can work only outgoing.
Incoming calls don't works
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Was this VoIP setup worked prior to the firmware upgrade? Could you please check the SonicWall logs for any error messages? Also, I would suggest you to perform a packet capture on the SonicWall based on phone's IP address(es) or port numbers.
Technical Support Advisor - Premier Services
@ChristianP - following
Was it an upgrade?
Try disabling sip transformations, enable consistent NAT, and disable UDP flood protection.
We have the same issue after upgrading to 6-5-4-8-89n yesterday night on one of our customers NSA2650 Clusters.
The VoIP provider confirmed that sip registration stopped working the second we installed the update.
When we do a WAN failover, sip registration works but the customer cant hear the other side.
Gonna open a case for this too.