Here are the service records needed to use the Tandberg VCS:

_h323ls._udp.company.com      srv     1 0 1719 vcs-e.company.com. _h323cs._tcp.company.com      srv     1 0 1720 vcs-e.company.com. _sip._udp.company.com              srv     0 0 5060 vcs-e.company.com. _sip._tcp.company.com               srv     0 0 5060 vcs-e.company.com. _sip._tls.company.com                 srv     0 0 5061 vcs-e.company.com. _sips._tls.company.com               srv     0 0 5061 vcs-e.company.com. _sips._tcp.company.com             srv     0 0 5061 vcs-e.company.com.

There should also be an a-record pointing to the vcs express. (in this example, vcs-e.company.com)

Also, should anyone ever need it, here are the ports that an endpoint needs opened outbound if it is registering directly to a VCS express:

TCP/2776 (Q931/H245 for external traversal endpoints) UDP/2776 (RTP Media from external traversal endpoints) UDP/2777 (RTCP Media control traffic from external traversal endpoints) UDP/1719 (H323 RAS signaling from gatekeepers/VCSes and traversal endpoints) TCP/1720 (Q931/H.225 call connect signaling)

UDP/5060 (SIP signaling) TCP/5060 (SIP signaling) TLS/5061 (Encrypted SIP signaling)