Etross-8848 GSM to analog converter has steady industrial module and reliable design, easy installation, optimized circuit directly connecting the exchange device for extensions, strong signals with high gain antenna supports SIM card, supports DTMF 2'nd dialing out, DTMF CLIP, hide subscriber caller id, reversal polarity signal for metering, signal indiator and power indicator and working status indicator. This converter can produce a FXS line to allow a regular phone to be connected and used just like a local landline. This device can both receive and make calls. .