Programming Routers for SIP Trunks
There are many routers and firewalls that will support SIP Trunks perfectly fine, such as those from Barracuda, Fortinet, SonicWall, Sophos, WatchGuard, and ZyXel; just to name a few. Here is some good direction on how to set them up!
Spydur Service SIP Trunking
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00:00 Background
01:42 Disclaimer
02:08 Access Rules
02:54 SIP Registrations
03:24 Port Forwarding
04:09 SIP Application Layer Gateway (SIP-ALG)
05:34 Wrapping Up