| Pin | Signal Description |
|---|
| 1 | Audio Out |
| 2 | Audio In |
| 3 | Accessory Sense. GND to enable External Mic and Speaker (Analog) |
| 4 | Audio Signal GND |
| 5 | Portable handsfree In. |
| 6 | Music Mute Out, High when phone is used. |
| 7 | In Flash Memory Voltage and Service Voltage,
In 0V=normal,+5V=test, +12V=test+flash |
| 8 | Logic Out, Status On. Sources over 100mA |
| 9 | Data Out from Mobile Station. Debug messages appear here at 112KBaud when in debug mode. |
| 10 | Digital Ground and DC return |
| 11 | Data in |
| 12 | DC in for battery charging, DC out for accessory power |