This event fires when the call is receiving a dial tone from the switch, which means that the switch is ready to receive a dialed number. Details about the dialtone are stored in the call's DialtoneMode property.

Avalabiltity

Design-Time: Read, Write / Run-Time: Read, Write

Declaration

procedure (Sender: TLine; Call: ThbTapiCall);
property OnDialtone: ThbTapiCallEvent;

Remarks

This event will fire only if the bit flag LINECALLSTATE_DIALTONE is set in the property ThbTapiLine.Address[<any available>].Caps.CallStates. The OnCallState event fires immediately before this event.

Please refer to the sections "LINE_CALLSTATE" and "LINECALLSTATE_DIALTONE" in TAPI's documentation for a more detailed information.