Knowledgebase: Digital Phone Services
SonicWall Router/Firewall
Posted by Nicky Smith on 30 June 2010 04:53 PM
Please be aware that we do not support the use of SonicWall firewalls with the use of our service. We have run through extensive testing with SonicWall's product and it is not 100% efficient in handling SIP and can cause numerous call routing and dropped call issues.

The setting changes outlined in this article are intended to optimally configure the SonicWall router, they will not entirely fix the known issues with this router.

In the firewall settings:

Disable SIP Transformations

Enable Constant NAT
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