C. Router
Many routers have proven to be compatible when installed correctly, therefore we do not recommend a specific route
Tips for a successful configuration
-UDP-NAT timeout for about 120-130 seconds
-Deactivation of SIP-ALG
-Activation of the consistent nat feature if applicable
-Deactivation of Store&Forward for NFON connections
We strongly recommend deactivating SIP ALG (SIP Helper...) on the router!
Since SonicWall routers / firewalls have a highly complex structure, we cannot provide support regarding the functionality in combination with the PBX.