The hearing officer may issue subpoenas. The parties may also request that the hearing officer issue subpoenas or a party's attorney of record may also issue a subpoena in whose behalf the witness is required to appear at a full hearing. The requesting party is responsible for serving the subpoena upon the witness. In the discretion of the hearing officer, and where the rights of the parties will not be prejudiced thereby, such testimony may be by telephone or other electronic means.