Cisco Telepresence Systems that are calling from a CUCM cluster to an H.323 registered device on a Cisco VCS Control do not work.
However, calls from the H.323 VCS registered devices to the same CUCM registered systems do work. What are two possible reasons?
A. the call from CUCM to VCS Control does not match any search rule
B. Calls from CUCM add ":5060" or ":5061" after the SIP address, unlike the VCS Control
C. both systems do not support TLS encryption
D. the SIP trunk has not enabled bidirectional mode
E. Cisco VCS Control is registered in the wrong partition
This question is WHACK! H.323 mode Off (H.323 is not supported between VCS and Unified CM)
https://www.cisco.com/c/dam/en/us/td/docs/telepresence/infrastructure/vcs/config_guide/X8-8/Cisco-VCS-SIP-Trunk-to-Unified-CM-Deployment-Guide-CUCM-8-9-10-11-and-X8-8.pdf
Ok further digging I found the details…VCS Ctrl is used for registering third party video endpoints.It helps enable interworking of Telepresence endpoints with H.323 and third party video endpoints[Polycom/MsLync]
https://community.cisco.com/t5/ip-telephony-and-phones/vcs-vs-expressway/td-p/2568752
there is a bidirectional SIP trunk only when creating it in ISDN
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/sip/configuration/15-mt/sip-config-15-mt-book/voi-sip-isdn.html
I think the correct answer is A and B
https://www.cisco.com/c/dam/en/us/td/docs/telepresence/infrastructure/vcs/config_guide/X8-7/Cisco-VCS-SIP-Trunk-to-Unified-CM-Deployment-Guide-CUCM-8-9-10-11-and-X8-7.pdf
I think A and D are correct.
A. ‘search rule’ and ‘route pattern’ basically means the same thing.
Nothing is wrong with B.
So I will go with A and D
Nothing is wrong with B. But that is not the reason for the call failure from CUCM to VCS. That is what I meant. So that is why I think B is not the correct answer.
I agree you need 2 search rules
I do not feel A is right as ‘search rule’ the term is used in the direction from VCS to CUCM, not the other way around.
Why D? I never heard of “Bidirectional Mode” of a SIP trunk.
But B is correct, I agree
It should be B and D
https://www.cisco.com/c/en/us/support/docs/unified-communications/expressway/213863-troubleshoot-most-common-issues-for-busi.html