call - CAU
- call accounting system
- call blocking
- call center
- call detail recording
- call directing code
- call distribution
- call distributor
- call diversion
- call forwarding -- all calls
- call forwarding -- busy
- call forwarding -- do not answer
- call forwarding -- follow me
- call monitoring
- call park
- call pickup
- call processing
- call progress tones
- call record
- call restriction override
- call restrictor
- call selection
- call splitting
- call status indication
- call transfer
- call transfer with consultation hold
- call waiting
- call waiting indicator
- call, hold
- call, local
- call, lost
- call, national
- call, toll
- call-back modem
- callback queuing
- called number
- called party
- calling number
- calling party
- calling party identification
- CalREN
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