You can activate the functions of your system by entering codes such as:
DND (do not disturb) on.
DND (do not disturb) off.
All codes to activate or enable functions are always introduced by pressing the star key, and all codes to deactivate, disable or delete functions are always entered starting with the pound key.
When using pulse telephones, the star key must be replaced by the code
and the pound key by
For example:
DND (do not disturb) on
DND (do not disturb) off
The codes may contain up to three digits.
An alphabetically ordered overview of all functions and their corresponding codes can be found in the Appendix (Quick-Reference Operating Instructions).
and the pound key by 
For example: