“Dect 5 phones transmit constantly. Does this phone only transmit when being used? Dect 6 2.5GHZ phones and base units transmit all the time, 24 hours a day. Old analog phones only when in use. Does this phone transmit all the time or only when in use, or paging, etc. I am looking for a good phone that only transmits from base and phone when in states of use, other than standby. "Thank you.”