2019 New York Laws
GMU - General Municipal
Article 10 - Firefighters and Police Officers
209-P - Relay of Fire and Emergency Calls.

§ 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 firefighters 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.