End-users must be able to access, where available, 911 emergency services, and 711 telecommunications relay services. The payphone service provider must allow 911 and 711 calls to be connected to the public service answering point at no charge without requiring a coin or credit card. Where 911 emergency service and/or 711 telecommunications relay services are not available, the caller must be instructed to dial "0" and calling "0" must, at no charge and without requiring a coin or credit card, directly connect the caller either with the local exchange service provider providing the payphone access line from which the call is made or with an OSP that will complete the emergency call at no charge.
Okla. Admin. Code § 165:58-5-5