This article relates to Cisco TelePresence Video Communication Server Expressway.
Q. When do calls on a VCS Control use a local (non-traversal) call license?
A. Any call where the VCS Control takes the signaling but not the media is considered a local call and will take one non-traversal call license. Below is a list of situations when the VCS Control takes the signaling and the media; if the call does NOT meet any of these criteria then it is a local call:
calls to or from a traversal server (i.e. firewall traversal calls)
calls that are gatewayed (interworked) between H.323 and SIP on the local VCS Control
calls that are gatewayed (interworked) between IPv4 and IPv6 on the local VCS Control
a SIP to SIP call when one of the participants is behind a NAT (unless both endpoints are using ICE for NAT traversal)
Note that a call may be a traversal call on one VCS but a local (non-traversal) call on another VCS in the call route, depending on whether each VCS in the route is required to take the media.
A VCS Control comes with 100 traversal calls and 10 local calls, so you may need to purchase additional licenses depending on the volume of calls in your network. Contact your TANDBERG representative for more information.