I want to have a GSM modem based on SIM 900A with voice calling and recieving option. It need to have a serial interface through which i can use AT commands as offered by the modem also. For voice I can attach a microphone and speaker. It should give some interface when call is coming and for making calls a simple button/switch can be used which will dial to a predefined number , so no need for keypad.
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Hi, I am expert in embedded system programming and development. I reviewed your project details and I would like to discuss it in more details. Looking Forward, Khawaja