The insurance company of the driver responsible for the wreck is responsible for paying BRB, which stands for Basic Reparation Benefits.  If they do not pay within 30 days of being notified, your insurance company must then pay your BRB.  Your insurance company will recoup its payouts from the other insurance company.

BRB or BRBs are sometimes referred to as PIP benefits; PIP is short for Personal Injury Protection benefits.