The i-CALL system is a check call management system that alerts a control room when a vulnerable worker fails to respond to an automated check call or activates a panic alarm. The scalable i-CALL server is configured based on call volume and connected to dedicated phone lines. It can enhance 24/7 monitoring by allowing operators to add, amend, and track check calls. Calls can be made via landline, mobile, or PDA using GPRS technology. The low-cost and scalable system can generate additional revenue by adding new monitoring users.