The scope of this standard is to provide implementation guidelines for the support of a Commercial Mobile Alert System (CMAS) supplemental information retrieval mechanism Purpose This standard defines a mechanism for a CMSP Gateway to retrieve optional supplemental information from the Federal Alert Gateway for CMAS Alert or Update messages. The mechanisms used for this retrieval are defined in the CAP Retrieval Process specified in the Joint ATIS-TIA J-STD-101@ CMAS Federal Alert Gateway to CMSP Gateway Interface Specification [Ref 1].