Connector - Siemens C25/S25null| Pin | Name | Direction | Description |
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| 1 | GND | --- | Ground | | 2 | SELF-SERVICE | Input | Recognition/control battery charger | | 3 | LOAD | Input | Charging voltage | | 4 | BATTERY | Output | Battery (S25 only) | | 5 | DATA OUT | Output | Data sent (S25 only) | | 6 | DATA IN | Input | Data received (S25 only) | | 7 | Z_CLK | --- | Recognition/control accessories | | 8 | Z_DATA | --- | Recognition/control accessories | | 9 | MICG | --- | Ground for microphone | | 10 | MIC | Input | Microphone input | | 11 | AUD | Output | Loudspeaker | | 12 | AUDG | --- | Ground for external speaker |
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