(b) If the arbitration agreement does not provide the manner in which such service shall be made and the person upon whom service is to be made has not previously appeared in the proceeding and has not previously been served in accordance with this subdivision:

1. (1) Service within this State shall be made in the manner provided by law for the service of summons in an action.
2. (2) Service outside this State shall be made by mailing the copy of the petition and notice and other papers by registered or certified mail. Personal service is the equivalent of such service by mail. Proof of service by mail shall be made by affidavit showing such mailing together with the return receipt of the United States Post Office bearing the signature of the person on whom service was made. Notwithstanding any other provision of this title, if service is made in the manner provided in this paragraph, the petition may not be heard until at least 30 days after the date of such service.