public void MakeCall(Person receiver, string message)
{
TelephoneLine line = the_exchange.MakeCall(this, receiver);
if (line != null)
{
line.Send(this, message);
}
// else, receiver not listening!
}
public void CallTo(Person person, string message)
{
TelephoneLine.Comunicate <Person>(this, person, message);
}
