Call denial circuit

Call denial circuit

Call devices

Call distributing service system for a plurality of terminals

Call distribution

Call distribution arrangement

Call distribution system utilizing global or local counter

Call diversion with destination querying

Call eavesdropping arrangement

Call establishment based on presence

Call establishment for simultaneous analog and digital...

Call features for automatic call distribution system

Call for service and continuity sensor circuit

Call forward managed rerouting

Call forwarding arrangement

Call forwarding arrangement for telephone answering service...

Call forwarding in a packet switched system with back up...

Call forwarding on busy or no answer when call waiting is...

Call forwarding on busy or no answer when call waiting is...

Call forwarding on busy or no answer when call waiting is...