California Code, Penal Code - PEN § 810

(a) The presiding judge of the superior court in a county shall, as often as is necessary, designate on a schedule not less than one judge of the court to be reasonably available on call as a magistrate for the setting of orders for discharge from actual custody upon bail, the issuance of search warrants, and for such other matters as may by the magistrate be deemed appropriate, at all times when a court is not in session in the county.

(b) The officer in charge of a jail, or a person the officer designates, in which an arrested person is held in custody shall assist the arrested person or the arrested person's attorney in contacting the magistrate on call as soon as possible for the purpose of obtaining release on bail.

(c) Any telephone call made pursuant to this section by an arrested person while in custody or by such person's attorney shall not count or be considered as a telephone call for purposes of Section 851.5 of the Penal Code.