Revision as of 18:41, 17 May 2022 (view source) Reedy (talk \| contribs) (→‎Example FireBrick Config: rm duplication) ← Older edit		Revision as of 11:23, 18 May 2022 (view source) Reedy (talk \| contribs) (→‎NAT: fix brackets) Newer edit →
=NAT= Avoid using NAT where possible. However, some NAT gateways provide an adequate SIP ALG (e.g. Technicolor TG582), and some devices provide NAT that works with the new call server (e.g. FireBrick 2500/2700 and many simple NAT routers). Using a STUN server (e.g. ''stun.aa.net.uk''}) is another possible solution. If NAT works, then well done, but if not we cannot guarantee to be able to make it work. If you have 2 phones behind a NAT router, they cannot have the same SIP port number, nor the same RTP port range (if they both used port number for SIP of 5060 then when an incoming call came in to external port 5060, NAT wouldn't know which phone to send it to).

VoIP Firewall (view source)