Call tracking using SIP presence mechanism
Call transfer arrangement using network services
Call transfer service using service control point and...
Call transfer system and electronic mail transfer system
Call transfer system and electronic mail transfer system
Call transfer with automatic return
Call treatment in portable number networks
Call waiting caller identifier
Call waiting calling party defined content
Call waiting cancellation device
Call waiting deluxe feature
Call waiting in call setup
Call waiting indicating method and system
Call waiting messaging
Call waiting priority alert
Call waiting priority alert
Call waiting processing system, and originating terminal unit, d
Call waiting response status
Call waiting service in a telecommunications network
Call waiting suppression