Refer to the exhibit.
A network engineer is attempting to register a Cisco TelePresence endpoint to a Cisco VCS. What is the most likely cause of this failure?
| A. |
The lab.local SIP domain is not configured in the Cisco VCS allow list for registration. | |
| B. |
The Cisco VCS failed to bind to the LDAP server, which is where the lab.local SIP domain is learned. | |
| C. |
The lab.local SIP domain does not exist on the Cisco VCS. | |
| D. |
The endpoint does not have the proper port assignments configured for SIP signaling. | |
| E. |
The endpoint uses the TCP protocol and the Cisco VCS is configured to allow only TLS for SIP registrations. |