Sigma ORION G provide us with backup communication, utilizing the mobile telephony network (GSM). It is used for the communication of the alarm panel with a signal reception center or with an answering machine, for reference to the personal telephones of the user, in case the communication through the fixed telephony network is not possible due to a fault or interruption of the line. It can also be connected to simple telephone devices and used for daily communication, in areas where there is no fixed telephony network or in a call center as an additional backup line.