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Sonicwall Firewall - SIP Transformations

Revised March 2016

Firewall => Advanced => Scroll down to "UDP":
Increase UDP timeout to 120*

*if this does not resolve port timeout issues, may need to also modify the Global UDP Connection Timeout: Advanced tab = Firewall => Access Rules => LAN/WAN and increase UDP to 120 to override any inherited UDP timeout rules

VOIP => Settings:
o Turn on Consistent NAT.
o For customers using the OnSIP Hosted PBX service and the Sonic Firewall, the SIP Transformations sections should be DISABLED (unchecked).

Note: OnSIP actually uses the packet header IN CONJUNCTION with the internal IP address inside the SIP packet to determine optimal settings, so we need both.

Additional step:
Firewall => Access Rules:
Add an 'Access Rule' for any traffic from WAN Network 199.7.172.0 Netmask 255.255.255.0 to the LAN. (not-shown)
Add an 'Access Rule' for any traffic from WAN Network 199.7.173.0 Netmask 255.255.255.0 to the LAN. (not-shown)
Add an 'Access Rule' for any traffic from WAN Network 199.7.174.0 Netmask 255.255.255.0 to the LAN. (not-shown)
Add an 'Access Rule' for any traffic from WAN Network 199.7.175.0 Netmask 255.255.255.0 to the LAN. (not-shown)

**CIDR Address**
199.7.172.0/22

UDP port timeout location in newer models/firmware (image date = June 2014)

 

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