FluffyVoice uses freepbx, and ive not changed much, following are Feature Codes you can use;
Call Forward & Call Waiting
Call Forward All Activate: *72
Call Forward All Deactivate: *73
Call Forward All Prompting Activate: *93
Call Forward All Prompting Deactivate: *74
Call Forward Busy Activate: *90
Call Forward Busy Deactivate: *91
Call Forward Busy Prompting Activate: *94
Call Forward Busy Prompting Deactivate: *92
Call Forward No Answer/Unavailable Activate: *52
Call Forward No Answer/Unavailable Deactivate: *53
Call Forward No Answer/Unavailable Prompting Activate: *95
Call Forward Toggle: *96
Call Waiting - Activate: *70
Call Waiting - Deactivate: *71
Voicemail & Info Services
Dial Voicemail: *98
My Voicemail: *97
Call Trace: *69
Echo Test: *43
Speak Your Exten Number: *65
Speaking Clock: *60
DND
DND Activate: *78
DND Deactivate: *79
DND Toggle: *76
Other
Wake Up Calls: *68