Handset
 Feature
 Code   Action
 -----  ----------------------------------------------
 *30    Blacklist a number
 *31    Remove a number from the blacklist
 *32    Blacklist the last caller
 *52    Call Forward No Answer/Unavailable Activate
 *53    Call Forward No Answer/Unavailable Deactivate
 *72    Call Forward All Activate
 *73    Call Forward All Deactivate
 *74    Call Forward All Prompting Deactivate
 *90    Call Forward Busy Activate
 *91    Call Forward Busy Deactivate
 *92    Call Forward Busy Prompting Deactivate
 *70    Call Waiting - Activate
 *71    Call Waiting - Deactivate
 *28    Day/Night Control Toggle
 *34    Perform dictation
 *35    Email completed dictation
 *78    DND Activate
 *79    DND Deactivate
 *422   Connect to Gabcast
 *54    User Intercom Allow
 *55    User Intercom Disallow
 *80    Intercom prefix
 *0     Speeddial prefix
 *75    Set user speed dial
 *97    My Voicemail
 *98    Dial Voicemail