California Code, Corporations Code - CORP § 2282.2

(a) The response by the corporation shall be by an officer or director and shall contain proof of service showing that a copy of the response was sent to the claimant, or if the claimant is represented by an attorney for purposes of the application, to the claimant's attorney, at the address specified in the application for the claimant or the claimant's attorney, respectively.

(b) If the corporation is not represented by an attorney in objecting to payment of the application, the response shall contain the name, title, and address of the officer, director, managing agent, or other responsible person authorized to represent the corporation and the address at which the corporation wishes to receive correspondence and notices relating to the application, and a telephone number at which the corporation's representative can be reached during regular business hours.  If the corporation is represented by an attorney in objecting to the application, the response shall contain the name, business address, and telephone number of the attorney.