Upgrade Legacy Alarm Panels to Cellular and IP Connectivity Landline connectivity is rapidly disappearing from the residential and small business markets. As consumers abandon their landlines for mobile phones and carriers switch from PSTN to VoIP networks, it’s becoming critical to upgrade customers with landline-only alarm systems to cellular and IP connectivity. With the Universal Dual Path Communicator (TL405LE), you can upgrade almost any legacy PSTN panel to LTE and IP and, using the ConnectAlarm mobile app, enable users to remotely arm, disarm and check the status of their legacy panels. This solution is a cost-effective way to enhance your customers’ security, make their systems smarter and extend the life of their panels.