As you know H.323 is opening dynamic connections (which comprise of both UDP and TCP). I don't know much about the Polycom implementation tough. By disabling inspection, I don't know if the firewall will be able to correlate the various control/data flows that comprise a single call (TCP / UDP) and apply the appropriate timeout.
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...