Definition of event delegate you should use if you want to receive the OnPhoneButton event.
[Visual Basic]
Public Delegate Sub OnPhoneButton( _
ByVal Sender As Object, _
Byval e As OnPhoneButtonArgs_
)
[C#]
public delegate void OnPhoneButton(
object Sender,
OnPhoneButtonArgs e
);
Namespace: TAPIEx
Assembly: TAPIEx.Net.Dll