I am currently running a PIX 515 with version 5.2(3) (old, I know). I am also running an Asterisk IP PBX on the inside of the network and accepting Voip calls from the outside.<BR><BR>I have the SIP ...

The SIP protocol is commonly used for IP telephone communications. Unfortunately it’s notorious for having issues with NAT traversal. Even some major vendors can’t seem to get it right. [Stephen] had ...