This article relates to Cisco TelePresence Video Communication Server Expressway.
Q. Why can't I make calls from my VCS using URI dialing over DNS?
A. To use DNS to call endpoints that are not registered to the local VCS or one of its neighbors, you must:
Configure the VCS with details of at least one DNS server that it can query. This is done via System configuration > DNS.
Create and configure a DNS zone to look up the URIs to be dialed:
For full information on zone configuration and URI dialing from the VCS using DNS, consult the VCS Administrator Guide.