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ESP - 01s

GPIO pins:

Source current 12 mA max
Sink current 20mA max

For normal boot:

Pin State
 RX  TX
 TX RX
 GDN GND
 VCC 3.3V
 GPIO 0 HIGH
 RST HIGH, pull LOW to reset
 CH_PD (Chip Enable) HIGH

pinouts

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Raspberry Pi 2

The Pi 2 is running FreePBX, with 2 Yealink handsets.