Call management service
Call message recording for telephone systems
Call monitoring apparatus and method therefor
Call pacing method
Call pacing method
Call patterns in a communications network
Call queuing utilization reporting
Call redirection feature for relay services
Call reporting
Call toll processing method and call toll processing apparatus
Call tracker
Call traffic control
Call transfer and conference with separate billing records...
Call validation system
Call-accounting system
Call-connecting device, call-connecting method,...
Call-disposition analyzer
Call-processing system and method
Call-processing system and method
Called party response detecting apparatus