Siemens HiPath 500 Operating Instructions Manual page 73

Saving Station Numbers, Functions, Procedures and Appointments
Step by Step
Select the stored procedure by pressing a key.
Procedures containing functions which can be
switched on/off can be activated by pressing the
key, and deactivated by pressing the same key
again.
You can also press a procedure key during a call.
The stored digits are automatically sent as DTMF
signals page 36.
For information on display messages when sav-
ing functions page 223
73