I am running phone proxy on an ASA5585 call manager is System version: 188.8.131.5201-3 we have 1000 license and around 200 people currently registered with the call manager. about a week ago we had about 15 users say the phone is no longer registering. The phone will show its trying to register with incorrect date and time and also shows the phone number. Call manager was rejecting them. I troubleshooted with TAC and we came across these phones are not receiving the CTL file from the ASA. TFTP is configured correctly and i know this because people said they were downloading new firmware. why would so many users be working fine then for no reason 15 phones completely stop working and deleting the itl and ctl does nothing. I shipped one user a new phone after configuring it here and he still can not connect. Bypassing home networks are not working as well. I really think this is a wonky issue with the ASA not passing out the CTL file. But i just cant figure out what it is
after while TAC engineers just push me away saying since phone proxys are no longer supported after call manager 7 that we need to migrate to VPN.
Any suggestions or comments are greatly appreciated I really want to figure this out so people can go on their merry way.
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...