protected void HangupImpl() => _modemImpl.Hangup();
protected void HangupImpl() { _modemImplementation.Hangup(); }
protected void HangupImpl() { _modemImplementation.Hangup(); Connected = false; }
protected void HangupImpl() => _modemImpl.Hangup();
protected void HangupImpl() { _modemImplementation.Hangup(); }
protected void HangupImpl() { _modemImplementation.Hangup(); Connected = false; }