In technical circles, NEO (often an acronym for New Engineered Optimization or similar proprietary names depending on the vendor) refers to a protocol stack or software overlay designed to extend the life of GSM infrastructure.
Security systems traditionally relied on landlines (PSTN) to call monitoring centers. As landlines vanished, the industry moved to GSM dialers. Today, the "Neo" prefix in security hardware (such as the popular Neo-GSM modules compatible with DSC, Honeywell, and other panels) implies . neo gsm