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...

Call signaling approach to user self-provisioning on VoIP...

Call signature in a packet-based network

Call transfer using session initiation protocol (SIP)

Call waiting feature for a telephone line connected to the...

Call waiting feature for a telephone line connected to the...

Call waiting feature for a telephone line connected to the...

Caller identification and voice/data synchronization for...

Caller information provision

Caller IP address

Caller-controlled routing to non-SIP/non-TEL URI...

CD-ROM on which a program for functioning as an IP telephone...

CDMA mobile data communication system and a method of...

Cell selector method and apparatus for use in time division mult