Alarm Receiver,
Append Message,
Authentication,
Automated Attendant,
Blacklists,
Blind Transfer,
Call Detail Records,
Call Forward on No Answer,
Call Forward Variable,
Call Monitoring,
Parking,
Queuing,
Recording.
Call Retrieval,
Routing (DID & ANI)
Call Transfer,
Waiting,
Caller ID,
Blocking,
Caller ID on Call Waiting.
Calling Cards.
Conference Bridging.
Database Store / Retrieve.
Database Integration.
Dial by Name.
Direct Inward System Access.
Do Not Disturb (Dnd).

Flexible Extension Logic.
Interactive Voice Response (IVR).
Local and Remote Call Agents.
Flexible Mp3-based System.
Random or Linear Play.
Volume Control,
Predictive Dialer,
Privacy,
Open Settlement Protocol (OSP),
Protocol Conversion,
Remote Call Pickup,
Remote Office Support,
Roaming Extensions,
Route by Caller ID,
Spell / Say,
Streaming Media Access,
Supervised Transfer,
Talk Detection,
Text-to-Speech (via Festival),
iLBC,
Linear,
LPC-10,
Speex,
Music On Hold,
Music On Transfer,
Local and Remote Call Agents,
Least Cost Routing (LCR)