Abbreviated dialing
Agent features
Alert calling
Attendant
Authority code
Auto answer
Auto hold
Auto line selection
Auto transfer
Call forwarding
Call parking
Call pickup
Call transfer
Callback
Camp- on
Class-Of-Service
Conferencing
DISA
Distinctive ring
Do Not Disturb
Drop timeout
Exchange lines
External loud bell
External paging
Feature check
Feature codes
Forced Account Code
Forced call diversion
Group listen
Headset mode
Hold
Hot keypad
Hotline
Least Cost Routing
Lock / Unlock
Look-up
Messages
Music-on-hold
Mute
Names
No-ring transfer
Numbering plan
Off-hook Voice-Announce
Paging
Power-fail telephones
Private-to
Re-dialling
Reminder service
Service modes
SMDR
Tenant groups
Toll Restriction
U.C.D.
Virtual numbers

Direct Inward System Access (DISA) is programmed on an trunk-by-trunk basis to allow external callers to access the following system resources from a remote DTMF telephone:

• user extensions
• voicemail extensions
• extension UCD groups
• outgoing exchange lines (individual lines, trunk routes and LCR)
• system abbreviated numbers

External callers accessing a DISA line can dial extension numbers and UCD groups without having to enter any security code. To access an exchange line and place an outgoing call, the DISA caller must have an "allowed" COS and enter a security code. Idle DISA lines are always available to internal users for placing an outgoing exchange call. Individual exchange lines can be assigned DISA access in one of four time-bands (Never, Day, Night or Always) and can have a talk-time limit imposed.