In the run-up to the test, we defined practical requirements and established the following test criteria:
- Scope of functions
- Call quality
To be able to evaluate these criteria, we have defined several tests for the office telephones. First, the scope of delivery is checked. The telephones are set up according to the manufacturer's specifications, and user-friendliness and effort are assessed.
In our tests we do not use a conventional telephone system, but the Internet telephony provider sipgate. Furthermore, the menu navigation and the existing functions are checked for all devices. During several telephone calls, the volume, clarity and connection of transmitter and receiver are assessed. Finally, it is tested whether the devices have additional functions such as apps, calendar and similar.
In order to rule out errors and to ensure that the devices are not subjected to the stress of everyday use, each test is carried out in several stages.
The test criteria are given percentages depending on their importance. The final mark is then calculated objectively from the test criteria using an algorithm.
Our product selection is based on the observation of the current market. In addition to popular brand products, we also include insider tips in our selection. Criteria such as price and range of functions are an important factor for us. The test field is also determined by analysis and evaluation of customer reviews and external tests (e.g. Stiftung Warentest).
The devices are purchased anonymously or lent to us by the manufacturer. Dealers and manufacturers have no influence on the tests and our evaluation.
As soon as new relevant products come on the market, our test field will be expanded to include them. The new products undergo the same tests as the already tested devices.