3 end users using the Cisco VT Advantage USB camera's.
Each end user has a different model phone - 7940, 7960, 7961.
Station to station calling is fine.
But on an intermittent basis, when calls are placed outside the local network, the end user either hears a reorder tone (fast busy) or nothing - dead air. It takes several tries and eventually the call will go thru.
By outside, I mean the caller dials 9 first and then the 7 digit DN.
VT Advantage v2.1.2
Camera driver version 1.0.4
No other phone experiences this problem, only the 3 associated with VT Advantage.