Virtual end office in a switched telephone network
Virtual inter-machine trunking feature for communication network
Virtual private communications network
Virtual private line connection system and method
Virtual private network connecting system
Virtual private network system and method using voice over...
Virtual signaling network method
Virtual telephone extension
Virtual terminal control device for switching system
Virtual wide area centrex
Virtual work environment for remote users
VoIP adapter, IP network device and method for performing...
VoIP call routing