I should add - the VCS expressway is interworking the SIP call back to H323 when it sends to the second VCS control. This happens in both the working and non-working scenarios - the problem seems to lie between the first VCS control and the expressway.
In relation to the upgrade question, I performed the staged upgrade and didn't go straight from 5.1.1.
I ended up getting it working by turning authentication off on the X5.1.1 expressway. The reason I haven't upgraded that one is that it has a traversal zone to another company who are still running an old version and they aren't ready to upgrade yet so I wasn't sure of the repruccusions of having a 7.1 to 5.1 traversal relationship.
First check the NTP on the originating and terminating gatekeeper and endpoints. is it synched with NTP or not.
ITU recommendation H.235 for security and encryption for H-Series (H.323 and other H.245-based) multimedia terminals.
This security covers authenticating and authorizing of H.323 calls between the administrative domains of Internet Telephone Service Providers (ITSPs) using tokens. An token is generated in the originating gatekeeper when an LRQ is initiated.
If the software of the Terminating endpoint/gateway is changed to a version where the token is not supported. In such a case, the Terminating gateway/endpoint is not able to extract the token from the setup message. This causes the terminating gatekeeper to reject the call with a disconnect reason of security denial.
So my question to you is what endpoint you tested with? what is the version you are running on to it. Also its a good idea to upgrade the other vcs to same software version.
The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...
This document describe how DST changes and how time changes are
implemented in DST. Daylight Saving Time (DST) is the practice of
setting the clocks forward 1 hour from standard time during the summer
months, and back again in the fall, in order to make b...