24 CFR §3288.33

1. (a)Once the screening neutral determines that a defect is properly alleged and timely reported, notice about the request will be forwarded to the parties by overnight delivery, commercial carrier, or fax.
2. (b)If the parties have not initiated the Alternative Process in accordance with § 3288.105 of this part within 7 days of the screening neutral's notification, the screening neutral will refer the matter to mediation.