Cal. Government Code § 8592.8

A “911” call, as described in Section 2896.1 of the Public Utilities Code, from a commercial mobile radio service telecommunications device may be routed to a public safety answering point other than the Department of the California Highway Patrol only if the alternate routing meets all of the following requirements: (a) The “911” call originates from a location other than from a freeway, as defined in Section 23.5 of the Streets and Highways Code, under the jurisdiction of the Department of the California Highway Patrol. (b) The alternate routing is economically and technologically feasible. (c) The alternate routing will benefit public safety. (d) The Department of the California Highway Patrol, the Office of Emergency Services, and the current or proposed alternate public safety answering point, in consultation with the wireless industry and local law enforcement officials, determine that it is in the best interest of the public, will provide more effective emergency service to the public to route “911” calls that do not originate from a freeway, as defined in Section 23.5 of the Streets and Highways Code, or any other area in which the Department of the California Highway Patrol has jurisdiction to respond, to another public safety answering point, and will result in “911” calls being routed to the responsible responding jurisdiction that covers the location of the call origination point.