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

Cellular network service over WLAN

Cellular network/WLAN VoIP service interaction by home...

Central office line card with code recognition for...

Centralized interworking function for a mobile radio network

Change of codec during an active call

Channel assignment in a spread spectrum CDMA communication...

Channel data extracting circuit and extracting method