Why can’t my security system dial out?

A security system that cannot dial out is not just a technical inconvenience. It means your monitoring center isn’t receiving signals from your building, and in an intrusion or emergency, no alert will go through. The failure is often silent — the panel may appear normal, the keypad may respond, and the system may arm and disarm without any indication that the communication path has been broken. Understanding why it happened is the first step to resolving it.

The copper line was terminated

If the security system stopped communicating without any obvious physical damage, this is the most important thing to check first. Security alarm panels use a POTS line to dial out to a central monitoring station. Carriers across the country are actively retiring copper telephone infrastructure. When a line is terminated, the panel loses its ability to communicate silently — no alarm on the panel, no error code; it simply stops connecting.

Carriers must now give only 90 days’ notice before terminating service, and that notice does not always reach the right person. If the line was terminated, this is not a repair situation. It requires a replacement solution that can restore the communication path without replacing the panel hardware itself.

A carrier fault or outage

Copper lines can fail due to physical damage to outside plant infrastructure. Weather events, nearby construction, cable cuts, and simple age can all cause a line to go down. Contact your carrier to confirm whether they have a reported outage or fault on the line serving the security panel. If it is a carrier-side issue, they are responsible for the repair. However, response times on copper lines have increased in many markets as carriers reduce maintenance investment in infrastructure they plan to retire.

The panel’s DACT has failed

The Digital Alarm Communicator Transmitter (DACT) inside the panel physically dials the monitoring center. It can fail even if the phone line works. Your alarm monitoring company or a licensed alarm technician can test the DACT separately from the line to determine whether the fault is in the communicator itself or in the communication path.

A connection issue at the demarc or building wiring

The point where the telephone line enters the building and connects to the security panel wiring can loosen or corrode, particularly in older buildings. A loose connection at the demarc, a damaged cable run, or a corroded terminal can cause the panel to fail to connect even when the carrier line and the DACT are both functioning correctly. Worth checking before assuming a larger problem.

A programming issue

If the panel’s dialing configuration has changed for any reason, it may no longer be connecting correctly. Your alarm monitoring company can verify the configuration and run a test call to confirm the communication path is working as expected.

Why the cause matters

The cause determines the path to resolution, and not all paths are equal.

• A programming issue can typically be resolved when your alarm monitoring company verifies the configuration and runs a test call.
• DACT failure requires a licensed alarm technician to replace the component and test the communication path end to end.
• Carrier line fault or outage requires a service ticket with the carrier, though resolution timelines on copper lines can be unpredictable.
• A terminated copper line requires a replacement solution — not a repair — and the replacement must restore the dialing path the panel was configured to use.

The silent failure risk is worth understanding. A security panel can appear fully operational — it arms, it disarms, the keypad responds normally — while the underlying communication path to the monitoring center is completely non-functional. Many organizations only discover this during a scheduled test, a carrier audit, or after an incident where the monitoring center received no signal.

What to do right now

Start with two immediate steps: contact your alarm monitoring company and check with your carrier.

Call your alarm monitoring company and tell them the panel is not connecting. They can run a test from their end to confirm whether signals are getting through, and they need to know the system is impaired so they can log it and advise on next steps. Most monitoring companies have a process for handling impaired systems and can help diagnose whether the issue is on their side or the panel side.

Contact your carrier to confirm whether the line serving the security panel is still active. If it has been terminated, start identifying a compliant replacement solution right away.

If the cause is a terminated copper line, a purpose-built POTS replacement connects at the demarc via a standard RJ-11 jack and restores the dialing path without replacing the panel hardware, the monitoring center phone number, or the access codes the panel was configured with.