Your handset operates on the basis of digital information transmission. However, certain applications, e. g. answering machines, can only be controlled using analog technology. For this you must send signals using the dual-tone multifrequency signalling (DTMF) process. 

Depending on how your system is configured (automatic tone dialling on or off - to be configured by the service engineer) you must first switch to DTMF dialling. This means, for example, that you can communicate with a variety of voice storage systems. 

You will find further details in the operating instructions for the relevant applications. 

Automatic tone dialling is not active

During a connection you must first switch to dual-tone multifrequency signalling. 

You are on a call. 

Call the system menu. 

Select and confirm the menu item. 

Select and confirm the menu item. 

Enter the numbers. All entries are sent as DTMF signals. 

Automatic tone dialling is active

Enter the numbers. All entries are sent as DTMF signals.