I'm having some trouble with h.323 (video) calls through a PIX 525 using NAT. We can get incoming calls fine, but not outgoing calls for some reason. My question has to do with 'inspect h323' vs 'fixup protocol h323'. What's the difference between them? The video conferencing unit in question has a NAT transversal option where I can supply an address and mask.I'm wondering if I'm having a NAT transversal problem anyway. Which one would handle the NAT transversal, inspect or fixup? Currently, the PIX config has:
inspect h323 h225
inspect h323 ras
do I need:
fixup protocol h323 h225 1718-1720
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
instead of the inspect commands? In addition to them?
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...
[toc:faq]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 and UDP are I...