All proceedings conducted by the arbitrators shall conform to the contractual obligations of the parties, and to the Code. The arbitrator shall comply with § 1404.4(b). The conduct of the arbitration proceeding is under the arbitrator's jurisdiction and control, and the arbitrator's decision shall be based upon the evidence and testimony presented at the hearing or otherwise incorporated in the record of the proceeding. The arbitrator may, unless prohibited by law, proceed in the absence of any party who, after due notice, fails to be present or to obtain a postponement. An award rendered in an ex parte proceeding of this nature must be based upon evidence presented to the arbitrator.