GSM Communicators are designed to ensure low-cost, high-speed and reliable alarm communications. It can be used as a backup for standard PSTN telephone line in the event of failure or as a replacement for standard telephone line when it is not possible to set it up. Messages about intrusion alarms, technical alarms, etc. can be sent by voice call or SMS to the end-user or directly by sending the Contact ID (CID) built-in to the Central Monitoring Station (CMS)...