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 size feedback on PNNI operation
Call trace on a packet switched network
Call tracking systems
Call tracking using voice quality measurement probe
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...
Call-detection algorithm for mitigating interference by...
Call-fail-safe method for wireless traffic distribution...
Call-number based customer identification method for...
Call-routing efficiency with a network access server
Called equipment selection method in ISDN packet switching mode
Caller identification and voice/data synchronization for...