Call control transfer circuit for step-by-step telephone...

Call control with transmission priority in a packet...

Call data collection and modification of received call...

Call distributing automatic telephone installation

Call distribution system

Call distributor with automatic preannouncement system and...

Call features for automatic call distribution system

Call initiation delay arrangement for digital data switching...

Call load sharing system between a plurality of data...

Call management in a wireless telecommunications system

Call management service

Call management services to telephone devices which are...

Call management system using dynamic queue position

Call metering for pabx telephone system

Call monitoring system for intelligent call processing

Call parking and paging system and method of operation

Call pickup service for pabx telephone system

Call processing restoration arrangement for telephone...

Call progress management

Call progress monitoring