Siemens 600 Series - Manual (Page 163)

Feature Access Codes A–3
Feature Access Codes
If you do not have a key on your phone for a feature
available in your system and class of service, you can
use that feature by dialing its feature access code.
Note
To access a feature using the key pad:
• If you have a dial tone, dial the feature access code.
• If you are already connected to another line, press
the Transfer (TRANSFER) key followed by the
feature access code.
Account Number
Bad Line Reporting
Busy Override
Buzz
Callback Request
Callback Request - Cancel
Changing Ring Tone