(a) "Party line" means a subscriber's line telephone circuit, consisting of two or more main telephone stations connected therewith, each station with a distinctive ring or telephone number.

(b) "Emergency call" means a telephone call to a police or fire department, or for medical aid or ambulance service, necessitated by a situation in which human life or property is in jeopardy and prompt summoning of aid is essential. 2. A person is guilty of unlawfully refusing to yield a party line when, being informed that a party line is needed for an emergency call, he refuses immediately to relinquish such line. Unlawfully refusing to yield a party line is a class B misdemeanor.