Alarm.com XT-512-US-AT Simon XT/XTi VoLTE Module, AT&T

Keep alarm communications resilient and streamlined with the Alarm.com XT-512-US-AT Alarm Communicator Module. Built for professional security integrators, this AT&T LTE VoLTE module replaces vulnerable phone lines and VoIP-only links, delivering encrypted cellular signaling for consistent alarm reporting and improved monitoring reliability. The module supports two-way voice over LTE when control panel firmware is 185 or higher and installs as a hybrid communicator compatible with common control panels. At just 1.87" x 4.06", it fits neatly inside most system enclosures and can be remotely programmed and updated using the Alarm AirFX Web toolkit—cutting truck rolls and speeding service. Ideal for residential and commercial surveillance and alarm systems, it enables interactive alerts, faster event verification, and better end-user engagement. Upgrade legacy communicators to cellular VoLTE to reduce false alarms, improve uptime, and maintain compliance with monitoring standards. Add the XT-512-US-AT to your next installation or retrofit to strengthen security, monitoring, and voice capabilities—order or contact sales to specify for your project.

• Provides secure AT&T LTE VoLTE signaling so your security system stays connected without a phone line
• Enables interactive monitoring and two-way voice (firmware 185+) to improve response and homeowner communication
• Remotely programmable via the Alarm AirFX Web toolkit for fast updates and reduced service visits
• Hybrid installation supports common control panels for flexible deployment on new or retrofit projects
• Designed for reliable alarm reporting and integration with surveillance and monitoring services