Brand: SIEMENS
Category: Telephone
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for C1
Uploaded: Nov. 21, 2025, 7:20 p.m.
Manual Publish Date: 2003-02-01
Warranty Information
24-month warranty for new devices against production or material defects.
Quick Overview
- Answering/Phonebook Key: Accept calls, initiate dialing, switch between handset and speakerphone, open phonebook.
- Speakerphone Key: Switch between handset and speakerphone.
- Message Key: Access caller and message list.
- Number 1 Key: Select T-NetBox/answering machine.
- Star Key: Turn ringtones on/off, switch between text input modes (uppercase, lowercase, numbers).
- Hash Key: Turn keypad lock on/off.
- R-Key: Enter a dial pause.
- Display Keys: Access functions shown on the display.
- End/Power Key: End calls, cancel functions, return to idle mode, turn handset on/off.
Charging the Battery
- Insert the battery correctly.
- Place the handset in the base station with the display facing up.
- Wait for automatic registration (approx. 1 minute).
- Charge the battery fully (recommended 5 hours for the first charge).
Troubleshooting and error codes
| Problem | Possible Cause | Solution |
|---|---|---|
| No dial tone | Handset not switched on | Press and hold the End/Power key for approx. 2 seconds. |
| Cannot make calls | Keypad locked | Press and hold the Hash key for approx. 1 second. |
| Low battery | Battery needs charging | Place the handset in the base station to charge. |
| Display not working | Handset switched off | Press and hold the End/Power key for approx. 2 seconds. |
| No incoming ringtone | Ringtones are switched off | Press and hold the Star key for approx. 2 seconds. |