Enhanced call waiting

Enhanced call-waiting service

Enhanced calling number delivery service system

Intelligent access control system

Intelligent access control system

Intelligent call waiting

Intelligent handling of message refusal

Internet call manager

Interruption of a call between two terminals by a call from anot

Method and apparatus for controlling call waiting service

Method and apparatus for detecting and recovering from call wait

Method and apparatus for detecting and recovering from call wait

Method and apparatus for informing active subscriber of disconne

Method and apparatus for managing incoming and outgoing...

Method and apparatus for managing incoming and outgoing...

Method and apparatus for providing ringback tones

Method and apparatus for selectively suspending or...

Method and apparatus for using voice commands to activate...

Method and apparatus permitting notification and control of bloc

Method and system for call notification