Section 209-P. Relay of fire and emergency calls

The fire department of
  any city may accept any  calls  for  aid  in  cases  of  fire  or  other
  emergencies  made  to  its  fire headquarters from territory outside the
  city and may relay such calls for aid in fires or other  emergencies  by
  such  means  as may be expedient to the fire department, fire company or
  fire district serving said territory. This section shall apply  only  to
  cities  participating  in  any legally authorized or recognized plan for
  furnishing mutual aid in cases of fire and other  emergencies  in  which
  the  services  of  firemen  would  be  used.  Any  city, village or fire
  district, any town which has a town fire department, or any  town  board
  on  behalf  of  a  fire  protection  district,  fire  alarm  district or
  territory outside any such municipal corporation or district, for  which
  aid  is  to  be  furnished, may contract with a city to accept and relay
  such calls, as  aforesaid,  and  the  amounts  payable  under  any  such
  contract  shall be a lawful charge against and paid as contracted for by
  the city, village, fire district, town which has a town fire department,
  fire protection district, fire alarm district or territory  outside  any
  such   municipal   corporation  or  district.  Any  city  accepting  and
  transmitting fire calls from territory outside the city, pursuant to any
  such contract, shall not be liable for any injury or death to persons or
  damage to property as the  result  thereof,  when  it,  in  good  faith,
  complies with or attempts to comply with the provisions of this section.