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Siemens C25 & S25 pinouts |
| Pin | Name | Function | in/out |
| 1 | GND | Ground | |
| 2 | SELF-SERVICE | Recognition/control battery charger | in/out |
| 3 | LOAD | Charging voltage | in |
| 4 | BATTERY | Battery (S25 only) | out |
| 5 | DATA OUT | Data sent (S25 only) | out |
| 6 | DATA IN | Data received (S25 only) | in |
| 7 | Z_CLK | Recognition/control accessories | |
| 8 | Z_DATA | Recognition/control accessories | |
| 9 | MICG | Ground for microphone | in |
| 10 | MIC | Microphone input | |
| 11 | AUD | Loudspeaker | out |
| 12 | AUDG | Ground for external speaker |
- The telephone detects the attached battery charger via Pin 2 and controls this via a PCM signal at the same pin.
- Accessories are detected via Pins 7 and 8
- The Headset identifies itself through HIGH/LOW instead of HIGH/HIGH