Call control using a layered call model

Call control with transmission priority in a packet communicatio

Call correlation tag for ATM messages

Call cut-off detection circuit for switch and method of the...

Call data and hardware cache for a dial-up access concentrator

Call disconnection method and exchange executing the same in ATM

Call establishment for multimedia call

Call establishment method for dial-up internet telephony...

Call flow system and method for use in a legacy...

Call flow system and method use in VoIP telecommunication...

Call forwarding in an IP multimedia subsystem (IMS)

Call forwarding method

Call forwarding methods and apparatus for mobile...

Call handling in a packet voice network

Call hold with reminder and information push

Call identification mechanism for multi-protocol telephones

Call information based matching system for stored program-contro

Call management in a TDMA system through variable packet...

Call management messaging system for integrating the...

Call management method, call management system and message...