MPEP § fp08.23.03
Telephone restriction practice is not permitted because it appears applicant has legal representation but a valid power of attorney has not been filed in the present application. Providing representative information in an Application Data Sheet (ADS) does not constitute a power of attorney. See 37 CFR 1.76(b)(4) and MPEP § 408. For information on appointing a power of attorney, see MPEP § 402.02 et seq.
This form paragraph should be used ONLY when a practitioner or customer number is identified in the ADS but no power of attorney is of record.