Interactive Answering Machine

Project Description

This device is being connected to Public Switched Telephone Network and has a wide range of possibilities. The device can answer an incoming call and make an outgoing call, detect caller ID, record and play speech and tone signal. The device is being connected in between PBX and a user phone and fully emulates PBX port, i.e. provides power supply to a phone line, generates high ringing voltage and detects phone pickup. The device can be powered from the 5V@1A power supply via micro USB cable. Installed STM32F415 MCU performs ADC/DAC conversions, digital signal processing and controls all operations. Also, the device has SDCARD connector and Ethernet port.