The best cordless ISDN phones in comparison

In this comparison, we present three of the best cordless ISDN phones. In addition to the equipment and the range of functions, the battery life and voice quality are also included in the evaluation.

1. ISDN phone: Gigaset S810A

• Equipment: The Gigaset S810A has a 1.8-inch TFT display and an answering machine with 55 minutes of recording time. In addition to the phone and the station, the scope of delivery also includes a battery and a power cord.
• Range of functions: The features of the Gigaset S810A include an environmentally friendly eco mode that reduces radiation. The device can also be paired with a Bluetooth headset and supports contact synchronization with Outlook. Up to 500 vCard entries can be placed on the device. The phone can be used as an alarm clock including a snooze function.
• Battery: Two 800 mAh batteries are included. Fully charged, they last up to 180 hours in standby and 13 hours in talk time. Alternatively, batteries with a capacity of 1, 000 mAh can be used for even more power.
• Voice quality: The voice quality is described by buyers of the Gigaset S810A as consistently good. Only the hands-free mode caused occasional criticism, which however not all buyers share.
• Price: The Gigaset S810A currently costs around 82 euros in online retail, including answering machines.

2. ISDN telephone: AVM FritzFon C4

• Equipment: The AVM FritzFon C4 has a color display and is supplied with a charging station, power supply and battery pack. The TFT screen has a resolution of 240 x 320 pixels. The keyboard is illuminated so that the individual keys can be seen even in the dark.
• Range of functions: With around 300 entries, the size of the phone book is slightly smaller than that of the Gigaset S810A. An Eco mode is also on board the FritzFon C4. Using a motion sensor, the phone automatically detects when the user picks it up. Several digital answering machines can be set up in connection with a FritzBox. The range of functions also includes a baby monitor feature and an alarm function.
• Battery: A 750 mAh battery is included in the scope of delivery, which enables a talk time of up to ten hours and a standby time of up to 144 hours. Although these are slightly worse values ​​than the competitor Gigaset S810A, the runtimes are completely sufficient for everyday use. The charging time is around six hours when the battery is discharged.
• Speech quality: The assessment of the speech quality of the AVM FritzFon C4 by buyers is almost exclusively positive. Customers are satisfied with both the quality of the calls and the hands-free mode.
• Price: The AVM FritzFon C4 currently has a purchase price of around 63 euros in online retail. This makes the device a little cheaper than the Gigaset competition.

3. ISDN phone: Gigaset SX810A

• Equipment: The Gigaset SX810A is a high-end solution among cordless ISDN telephones. The device has a 1.8 inch color display, an illuminated keyboard, an answering machine and comes in a high-quality design.
• Features: The answering machine saves voice recordings of up to 55 minutes in length. Contacts can be synchronized via Bluetooth and headsets for hands-free calling can be connected. If desired, contacts can be saved with several numbers and accessed with individual one-touch dialing keys. The Eco-Dect mode lowers the transmission power of the base station by up to 80 percent and at the same time saves battery. An alarm clock with a snooze function is also on board.
• Battery: Fully charged, the battery of the Gigaset SX810A lasts up to 13 hours for phone calls and up to 180 hours in standby mode. The values ​​correspond to the somewhat cheaper S810A model and are among the best among current cordless ISDN telephones.
• Speech quality: Most customers find the speech quality to be good and clear - both during normal calls and when using the hands-free system. There is occasional talk of a somewhat muffled sound, which, however, hardly disturbs everyday life.
• Price: With a price of currently around 124 euros, the Gigaset SX810A is comparatively expensive, but you get a high-quality ISDN telephone with all the necessary features and numerous special functions.

Conclusion: Which ISDN phone is the best?

• All of the devices presented meet a high standard and are also ideally suited for frequent callers. Ultimately, it is at the individual discretion of the user, in which areas he sets his priorities and which features must be on board. If you need a top device with long battery life, good speech quality and reduced radiation, the Gigaset SX810A is the right choice. A cheaper device is also sufficient for users with slightly lower requirements.

In the next practical tip, we will introduce you to some more and cheaper landline phones.