I have a PIX 515e that front ends a SIP trunk for our VoIP call processor. The call processor is in a private network and is NATed at the PIX for VoIP traffic to a 3rd party voice gateway on the Internet.
The problem I am having is that when the PIX NATs the traffic, it also modifies the SIP SDP IP addresses in the SIP packet from the private IP, to the public IP.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...