You have an endpoint registration problem with VCS, and the event log reason of "unknown domain". The domain names that your endpoints are using to register with must be added to this list. Where do you check the list of defined domains?
A. VCS configuration > Domains > SIP
B. VCS configuration > Protocols > SCCP > Domains
C. VCS Domains > Protocols > SIP
D. VCS configuration > Protocols > SIP > Domains
Checked in VCS in Cisco dCloud. Answer is D, its the only option in VCS.
Mike’s answer is correct for newer versions of VCS. But for older versions the correct answer is VCS configuration > Protocols > SIP > Domains. So if you get this question with the list of answers above the correct answer is D.
Task 7: Configuring SIP Domains The VCS acts as a SIP Registrar for configured SIP domains, accepting registration requests for any SIP endpoints attempting to register with an alias that includes these domains.
■ Registration restriction (Allow or Deny) rules can be configured to limit acceptable registrations. See Task 12: Configuring Registration Restriction Policy (Optional), page 28. ■ If authentication is enabled, only devices that can properly authenticate themselves will be allowed to register. To configure a SIP domain:
1. Go to Configuration > Domains. 2. Click New. 3. Enter the domain name into the Name field, such as example.com. 4. Click Create domain. 5. The Domains page displays all configured SIP domain names.
Answer: D is correct
https://www.cisco.com/c/en/us/td/docs/telepresence/infrastructure/articles/vcs_endpoint_registration_problems_kb_460.html
Event log reason Configuration area
Unknown domain SIP domains
How to fix it:
Check your list of domains (VCS configuration > Protocols > SIP > Domains).
The domain names that your endpoints are using to register with must be added to this list.
The domain name must be configured on the Cisco VCS to allow SIP endpoint to register, using the domain name as part of the URI. To configure a SIP domain: 1. Go to the Domains page (VCS configuration > Protocols > SIP > Domains).Oct 2, 2010
Cisco VCS Basic Configuration Single Cisco VCS Control Deployment …
The answer is incorrect, the correct answer should be VCS Configuration > Domains. All the other options do not exist