72 Model 51i IP Phone User GuideAdditional Features Enable/Disable Call WaitingThe call waiting feature notifies the user on an active call, of a new incoming call.You can disable the call waiting feature, so that the new incoming call isautomatically rejected by the phone with a busy message.If you disable call waiting on the phone, and the user is on a call, any furtherincoming calls receive busy unless “Call Forward Busy” or “Call Forward NoAnswer and Busy” is configured on the phone (for information on"Call Forwarding", see page 67.) It then forwards the call according to the ruleconfigured. The phone can only:• transfer the currently active callor• accept transferred calls if there is no active calls.If call waiting is disabled:• intercom calls are treated as regular incoming calls and are rejected.• pre-dialing with live dial pad disabled still accepts incoming calls.• the “Incoming Call Interrupts Dialing” parameter is ignored because theincoming call is automatically rejected (for information on "Incoming CallInterrupts Dialing" see page 78).• the Missed Calls List does not get updated with details of calls.• the Blind Transfer feature on the phone may not work if two calls are made tothe phone at one time.You can disable call waiting using the configuration files or the Aastra Web UI.