private void OnMonitoringCallStateChanged(object sender, int call, CORESIP_CallStateInfo info)
{
if ((_To == null) || !_To.HandleChangeInCallState(call, info))
{
TlfIaPosition from;
if (_Froms.TryGetValue(call, out from))
{
bool handled = from.HandleChangeInCallState(call, info);
Debug.Assert(handled);
}
}
}
