Transports the calcitonin gene-related peptide type 1 receptor (CALCRL) to the plasma membrane. Acts as a receptor for calcitonin-gene-related peptide (CGRP) together with CALCRL. Heterodimer of CALCRL and RAMP1. Expressed predominantly in the thymus, skeletal muscle, embryonic and adult brain, embryonic and adult lung, and colon. Belongs to the RAMP family.