GSM FWT 8848 for Payphone Use

GSM FWT-8848 is a GSM to Analog Converter(single port, insert 1 SIM card only), the device can produce a FXS line to allow a regular phone to be connected and used just like a local landline(PSTN) except your calls will go out the GSM network. This device can both receive and make calls. Features: 1) It is a 1 channel GSM Gateway which has 2 RJ-11 outputs for extensions; 2) It can connect with ordinary telephone set, PBX, VoIP Gateway, Billing meter etc.; 3) Dialing tone frequency: 450Hz; 4) Employ Industrial module to make; 5) Can adjust dial interval from 0.5sec to 9 secs by setting up from telephone set; 6) Can adjust voice volume by setting up from telephone set; 7) SIM card supported (1.8V, 3V); 8) Caller ID display; 9) DTMF Dialing; 10) Bell signal; 11) Polarity reversal; 12) The RJ-11 socket which connect the phone or billing system for metering purpose; 13) Antenna socket (SMA); 14) IP Presetting; 15) Working status and Signal Strength by LED indicator; 16) IMEI Change (optional). 17) back up Li-ion battery( Optional) 7.2V 1300mAh. Standby 24hrs, talking time: 2.5hrs. 3, Technical Specifications Air interface standard: GSM850/1900MHz, 900/1, 800MHz phase 2+ full band Frequency ranges: A) GSM 850 GSM 1900: I) Transmission: 869.2 ~ 893.8MHz I) Transmission: 1, 930 ~ 1, 990MHz Ii) Reception: 824.2 ~ 848.2MHz Ii) Reception: 1, 850 ~ 1, 910MHz B) GSM 900: GSM 1800: I) Transmission: 890 ~ 915MHz I) Transmission: 1, 710 ~ 1, 785MHz Ii) Reception: 935 ~ 960MHz Ii) Reception: 1, 805 ~ 1, 880MHz Phone interface: Supply RJ-11 Phone Interface Hanging voltage: 45V Picking off voltage: 30mA / 41mA Dialing tone Frequency: 450Hz Antenna interface: Antenna amplifying>2.5dB Sensitivity: