Cisco TelePresence Administrator's Manual page 384

Reference material
DNS configuration examples
This will give the command line that named (the BIND server) was invoked with. If there is a -t option, then
the path following that is the new root directory and your files will be located relative to that root.
In /etc/named.conf look for a directory entry within the options section. This will give the directory in which
the zone files are stored, possibly relative to a new root directory. In the appropriate zone section, a file entry
will give the name of the file containing the zone details.
For more details of how to configure BIND servers and the DNS system in general see the publication DNS
and BIND.
Cisco VCS Administrator Guide (X8.1.1) Page 384 of 507