Okla. Stat. tit. 63 § 2808
In implementing systems pursuant to this act, all public agencies in a single system may annually enter into a joint powers agreement or any other form of written cooperative agreement which is applicable when need arises on a day-to-day basis. Every employee of every public safety agency which is a participant in a system may respond and take any action to any call whether within or without the authorized territorial jurisdiction of the public safety agency. In response to emergency calls, employees of public safety agencies shall have the same immunity for any acts performed in the line of duty outside their authorized jurisdiction as they enjoy within it. No cause of action shall be created by any incorrect dispatch or response by any system or any public safety agency.
Okla. Stat. tit. 63, § 2808