Engine.CancelOutboundCall Method

If you received a handle from one of the GetOutboundHandle methods and then subsequently do NOT call StartOutboundCall() then you must issue a cancel to free up the port to be selected for a future call

[Visual Basic]
Public Sub CancelOutboundCall( _
ByVal handle As Integer _
)

[C#]
public void CancelOutboundCall(
int handle
);