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Using the Class 5 Services
Voice Gateways System Manual 81
A.2 Using the Class 5 Services
A.2.1 Call Waiting
Description: One on-going call active, audible CW tone indicating new incoming
call in progress.
A.2.2 Call Inquiry
Description: One on-going call active, place a new call to a third party.
A.2.3 Call Alteration
Description: Two on-going calls active, switch between calls.
A.2.4 Call Drop
Description: Two on-going calls active, disconnect one of the calls.
Table A-2: Call Waiting Service
Action Event
R0 Reject incoming call
→ Calling party hears busy tone. Continue with active
call.0
R1 Disconnect on-going call and answer incoming call.
R2 Place on-going call on hold, answer incoming call.
Table A-3: Call Inquiry Service
Action Event
R2+telephone number Place on-going call on hold (dial tone), Inquire new call to a third party.
R1 Return to call placed on hold if third party is not answering.
Table A-4: Call Alteration Service
Action Event
R2 Switch between two on-going calls. Places non-active call on hold.