The Art.2270/4G GSM module is designed to work on the same technology as mobile phones and also interface with the VX2200 digital 2 wire bus system. It enables a call to be made from an entry point (door or gate) to any telephone number (mobile or land line). The interface module can connect directly to the 2 wire databus and is compatible with the full range of VX2200 intercom panels both functional or digital. This flexibility means it can be integrated into small or large scale VX2200 digital systems that also comprises of Videx audiophones and videophones. Another key feature is that it can be connected via the RS485 BUS to additional access keypads and/ or proximity readers (up to 8 devices max.) allowing for a networked access control system which can be managed remotely.