An interface provides a non-dedicated wireless communications path for reporting alarm events from a landline-based alarm system to a remote monitoring system via BLUETOOTH. The interface includes a BLUETOOTH receiver that communicates with a cellular handset, or other wireless device that has a BLUETOOTH transmitter, and a network connector (such as RJ31X jack) between an alarm control panel and the PSTN. When a wireless device is within range of the interface, the interface bypasses the landline and routes all security calls from the alarm control panel through an analog-to-digital signal processor and to the wireless device via BLUETOOTH, which places a call to the remote monitoring center.