Answers to
frequently asked questions

You have questions regarding your telephone? Here you will find answers. Just select your product category (e.g. ISDN phones) and click on the relevant product.


Please select a product category and / or product.


Reset handset

With the following procedure all handset settings including the directory, redial list etc. will be deleted!

• Switch off handset
• Hold down the keys 1, 4, 7 and switch the handset on
• "Service" will be displayed
• Enter 4 6 8 5 4 6 3
• The handset switches off