Aastra 6757i CT Installation Manual page 2

Warning: Any changes or modifications not expressly approved by
the party responsible for compliance could void the user's authority
to operate the equipment.
Warning: This equipment complies with FCC and IC RF radiation
exposure limits set forth for an uncontrolled environment. This
device must be operated such that; a minimum separation distance of at
least 20cm is maintained between the radiator (antenna) & user's/nearby
people's body at all times and it must not be co-located or operating in
conjunction with any other antenna or transmitter.