1. Introduction
Thank you for choosing the Gigaset COMFORT 520A Trio cordless phone system. This manual provides essential information for the proper setup, operation, and maintenance of your new phone system. Please read these instructions carefully before use to ensure optimal performance and longevity of your device.
2. Package Contents
Before you begin, please verify that all items are present in your package:
- 3 x Gigaset COMFORT 520A Handsets
- 1 x Base Station (with integrated answering machine)
- 2 x Charging Cradles (for additional handsets)
- 3 x Power Adapters (for base station and charging cradles)
- 1 x Telephone Connection Cable (TAE)
- 6 x AAA Rechargeable Batteries
- 3 x Battery Covers
- 3 x Belt Clips
- 1 x Quick Start Guide

Image: The Gigaset COMFORT 520A Trio system, showing three handsets and the main base station. One handset is docked in the base, another in a charging cradle, and the third is lying flat.
3. Setup
3.1. Battery Installation
- Open the battery compartment cover on the back of each handset.
- Insert the two supplied AAA rechargeable batteries into each handset, observing the correct polarity (+/-).
- Close the battery compartment cover securely.
3.2. Connecting the Base Station
- Connect the telephone connection cable to the 'LINE' socket on the base station and to your telephone wall socket.
- Connect one power adapter to the 'POWER' socket on the base station and plug it into a mains power outlet.
- Place the base station on a flat, stable surface, away from other electronic devices that may cause interference.
3.3. Connecting Charging Cradles
- Connect the remaining two power adapters to the charging cradles and plug them into mains power outlets.
- Place the charging cradles in convenient locations.
3.4. Initial Charging and Handset Registration
- Place all handsets into their respective base station or charging cradles. The display will indicate charging.
- Allow the handsets to charge for approximately 8-10 hours before first use to ensure full battery capacity.
- The handsets are pre-registered to the base station. If a handset is not registered, follow the on-screen instructions or refer to the quick start guide for manual registration steps.
4. Operating Instructions
4.1. Making and Receiving Calls
- Making a Call: Press the green call key, then dial the number. Alternatively, dial the number first and then press the green call key.
- Receiving a Call: When the phone rings, press the green call key to answer.
- Ending a Call: Press the red end call key.
4.2. Hands-Free Function
During a call, press the hands-free key (speaker icon) to activate or deactivate the hands-free function. This allows you to speak without holding the handset.
4.3. Answering Machine
The base station includes an integrated digital answering machine. You can access and manage messages directly from the base station or any registered handset.
- Playing Messages: Press the play button on the base station or navigate to the 'Answering Machine' menu on a handset.
- Recording a Greeting: Access the answering machine settings via the handset menu to record your personalized greeting.
- Remote Access: You can access your answering machine remotely by calling your home number and entering your PIN.
4.4. Phonebook
The phonebook can store up to 200 contacts. Each entry can include a name and multiple numbers.
- Adding a Contact: Navigate to the 'Phonebook' menu, select 'New Entry', and enter the name and number.
- Searching for a Contact: Press the phonebook key and use the keypad to type the first letters of the contact's name.
4.5. Call Protection
The Comfort Call Protection feature helps block unwanted calls. You can add up to 150 numbers to a local and individual block list. When the list is full, the oldest blocked number is automatically replaced by the new one.
- Blocking a Number: During or after a call, access the call options and select 'Block Number'.
- Managing Block List: Access the 'Call Protection' settings in the menu to view and edit your blocked numbers.
4.6. Headset Connection
Each handset is equipped with a 3.5mm jack for connecting a headset, allowing for private conversations or hands-free use with improved audio clarity.
5. Maintenance
5.1. Cleaning
Wipe the handsets and base station with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure no liquid enters the device.
5.2. Battery Care
- Use only the recommended rechargeable AAA NiMH batteries.
- To maintain battery life, fully discharge and recharge the batteries periodically.
- If the phone will not be used for an extended period, remove the batteries to prevent leakage.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No dial tone | Telephone cable not connected or faulty. | Check the telephone cable connection to the base station and wall socket. Try a different cable if available. |
| Handset not charging | Handset not correctly placed in cradle; dirty charging contacts; faulty power adapter. | Ensure handset is seated correctly. Clean charging contacts on handset and cradle with a dry cloth. Check power adapter connection. |
| Poor sound quality / Interference | Handset too far from base; interference from other electronic devices. | Move closer to the base station. Relocate the base station away from other electronics (e.g., Wi-Fi routers, microwaves). |
| Answering machine language incorrect | Incorrect language setting or regional variant. | Access the answering machine settings via the handset menu and select the desired language. If the desired language is not available, this unit may be a regional variant. |
| Handset displays "Base not found" | Handset out of range; base station not powered; handset de-registered. | Move handset closer to base. Check base station power. Re-register the handset if necessary (refer to quick start guide). |
7. Technical Specifications
| Feature | Specification |
|---|---|
| Brand | Gigaset |
| Model | COMFORT 520A Trio |
| Screen Size | 2.2 Inches |
| Battery Type | NiMH AAA Rechargeable |
| Number of Batteries | 2 per handset (6 total included) |
| Power Source | Battery Powered / Mains Adapter |
| Dialer Type | Single Keypad |
| Item Dimensions (LxWxH) | 5.2 x 2.6 x 16.1 cm (Handset) |
| Answering System Type | Digital |
| Item Weight | 116 Grams (Handset) |
| Phone Standby Time | Up to 320 hours |
| Caller ID | Yes |
| Headset Compatibility | 3.5mm Jack |
| Call Protection | Up to 150 blocked numbers |
| Phonebook Capacity | 200 contacts |
8. Warranty and Support
8.1. Warranty Information
For detailed warranty information, please refer to the warranty card included in your product packaging or visit the official Gigaset website. Keep your proof of purchase for any warranty claims.
8.2. Customer Support
If you encounter any issues not covered in this manual or require further assistance, please contact Gigaset customer support. Contact details can typically be found on the official Gigaset website or in your product documentation.
9. ECO DECT Technology
The Gigaset COMFORT 520A Trio utilizes ECO DECT technology, which ensures reduced energy consumption and variable transmission power. This means the phone automatically reduces its transmitting power depending on the distance to the base station, contributing to lower energy use and reduced radiation.

Image: A graphic indicating 'MADE IN GERMANY' with the German flag colors, overlaid on a blurred image of a Gigaset phone in a pocket, highlighting the product's origin and quality.





