Call control model for a packet-based intelligent...
Call control network, access control server and call control...
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 hold with reminder and information push
Call identification mechanism for multi-protocol telephones
Call management messaging system for integrating the...
Call notification feature for a telephone line connected to the
Call processing architecture
Call processing method and apparatus for mobile terminal in...
Call set-up method using SIP-T overlap signaling
Call setting method for network system
Call setup for IP/Internet telephony
Call setup gateway for telecommunications system
Call setup method
Call setup request confirmation
Call signaling approach to user self-provisioning of VoIP...