Curious. When you enable the zone configuration and save, VCS will send OPTION to CUCM and hopefully it returns 200 OK, but may return 200 Ok with a failure code perhaps.
Hopefully, you have a trunk configuration in the opposite direction (CUCM->VCS), cause CUCM may in turn deny you access since it doesn't know what that IP address is.
If you turn off SIP on the zone, enable network log to debug (Maint>Diagnostics>Diagnostic Logging) and turn on SIP with CUCM zone back on, you may need to look at the OPTION ping from VCS to CUCM, and what the CUCM returns and maybe we can ascertain whats up.
I tried to set the profile zone to Custom and now it works fine. We fully established the connection between CUCM and VCS. Calls from IP phone on CUCM to video endpoint on VCS and vise versa is working well.
Just to share the VCS configuration under Zone profile:
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