The external call transfer – is the call transfer to a telephone line other than the company’s telephone line. The internal call transfer – the transfer of an incoming call to another addressee registered on the same telephone line.
Putting the call on hold by pressing the “Flash” button; the holding time is not limited. The function could be easily used at the moment when the second call has entered the line. By pressing the hold button the conversation will be set on pause and another call can be answered, finishing which you can return to the one which is on the pause mode.