Call waiting suppression
Call waiting using external notification and presence detection
Call-associated data transfer among multiple...
Call-back controllable exchange and call-back control method...
Call-back method for telecommunications and devices adapted...
Call-back number voice capture method and apparatus
Call-back number voice capture method and apparatus
Call-forwarding system using adaptive model of user behavior
Call-routing mechanism for automatically performing number...
Call-to-make reminder system
Callback imitation as incoming calls
Callback telecommunication system and method
Callback when not engaged by means of automated redialling...
Called subscriber selecting system
Caller control of call forwarding services
Caller control of call waiting services
Caller control of internet call waiting
Caller control of internet call waiting
Caller directed routing of a telephone call based on a dialed su
Caller directed routing of toll free calls using variable prefix