Sell GSM Interface Card For Payphone

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Description:1. Support 3x4 standard payphone keyboard. 2. Support LCD display interface. 3. Support polarity reversal signal or 12khz or16khz of metering pulse 4. Support PSTN and GSM routing auto switch (Least Cost Routing). 5. WAVECOM2303,WAVECOM2403,SIMENSE TC35 or TC35I are selectable 6. Auto-prefix of Local area code (programmable) 7. Network locking facility (Programmable) 8. PIN code locking function for SIM card protection 9. Forbidden numbers can be programmed. 10. Preferably to work on 12 VDC for batteries (Accumulator battery) 11. Support External Antenna for better reception 12. When user pick up the handset, it display coin please (User should provide us interface definition and detail parameter of coin sensor), and when the subscriber get connected, the FCT generates the polarity reversal signal and gets validated to drive the coin sensor. The charges will be display on the LCD, and the time say from 1 sec to 99 secs