These are the default star (*) codes for a FreePBX system. They are also generally a standard used by many phone systems. They can be changed in the FreePBX administration portal.
Blacklist
*30 – Blacklist a number
*32 – Blacklist the last caller
*31 – Remove a number from the blacklist
Call Forward
*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
*52 – Call Forward No Answer/Unavailable Activate
*53 – Call Forward No Answer/Unavailable Deactivate
*740 – Call Forward Toggle
Call Waiting
*70 – Call Waiting – Activate
*71 – Call Waiting – Deactivate
Core
*8 – Asterisk General Call Pickup
555 – ChanSpy (then * to toggle through extensions)
666 – Dial System FAX
** – Directed Call Pickup
*2 – In-Call Asterisk Attended Transfer
## – In-Call Asterisk Blind Transfer
** – In-Call Asterisk Disconnect Code
*1 – In-Call Asterisk Toggle Call Recording
7777 – Simulate Incoming Call
*12 – User Logoff
*11 – User Logon
888 – ZapBarge
Day Night Mode
*280 – 0: Emergency
*281 – 1: Additional announcement to play to support if on (night)
Dictation
*35 – Email completed dictation
*34 – Perform dictation
Do-Not-Disturb (DND)
*78 – DND Activate
*79 – DND Deactivate
*76 – DND Toggle
Follow Me
*21 – Findme Follow Toggle
Info Services
*69 – Call Trace
# – Directory
*43 – Echo Test
*65 – Speak Your Exten Number
*60 – Speaking Clock
Paging and Intercom
*80 – Intercom prefix
*54 – User Intercom Allow
*55 – User Intercom Disallow
Phonebook Directory
*411 – Phonebook dial-by-name directory
Queues
*45 – Queue Toggle
Recordings
*99 – Check Recording
*2968 – Edit Recording: Additional_Support_Announcement
*2969 – Edit Recording: ServiceAnnouncement
*77 – Save Recording
Speed Dial Functions
*75 – Set user speed dial
*0 – Speeddial prefix
Voicemail
*98 – Dial Voicemail
*97 – My Voicemail