(a) On the filing of an agreed child support review order signed by all parties, together with waiver of service, the court shall sign the order not later than the seventh day after the filing of the order. On expiration of the seventh day after the filing of the order, the order is considered confirmed by the court by operation of law, regardless of whether the court has signed the order. The court may sign the order before filing the order, but the signed order shall immediately be filed.
(b) On confirmation by the court, the Title IV-D agency shall immediately deliver to each party a copy of the signed agreed review order.