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Disable Call Waiting with *70 seems not to work most of the time; and is generally used when you really do not want your call to be interrupted, or when placing or receiving a fax call.
A workaround, if it can be termed as such is to use the Do-Not-Disturb *04 feature.
•When placing a call, first dial *04, hangup and place your call.
•When receiving a call, answer it, and if you do not wish to be disturbed further, flash the line, dial *04, and then flash again to resume your initial call.
In both cases, when you have completed your call, you have to remember to deactivate Do-Not-Disturb with *04, or else all future incoming calls will go to VoiceMail.
NOTE: Urgent Calls Screened through Concierge Call Treatment will still ring through when Do-Not-Disturb *04 is enabled.