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
https://www.spydurtechnologies.com/telecom/spydurservice/
Learn about the SpydurPBX
https://www.spydurpbx.com/
Contact Us!
https://www.spydurtechnologies.com/contact/
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
