Free edition vs Commercial editions

General Phone System Features
Call Logging
Call Reporting
Blind Call Transfer
Attended Call Transfer
Call Forward on Busy
Call Forward on No Answer
Call Routing (DID)
Caller ID
Conference Calling
Auto Attendant / Digital Receptionist
Voice Mail
Music on Hold
Ring Groups
Hunt Groups
Central Phonebook
Call Parking
Call Pickup
Call Queueing
Call Recording
Dial by Name
MWI - Message Waiting Indicator
BLF Status Updates
Conference Rooms
Intercom
Paging

Management and Scaleability
Web-based management console
Configuration wizard
Real Time Web-based System Status
Integrated Web Server
Automated Restore and Backup
Firewall Friendly Configuration of External Extensions via Tunnel
Microsoft Windows Server 2003 Certified
Integrated Enterprise Database (PostgreSQL)
Ability to Run as Windows 2008 Virtual Machine
Ability to Run as VmwareVirtual Machine
Supports Windows Clustering
Automatic Phone Provisioning
Allow Users to Configure their Own Extension Settings

Unified Communications and Mobility
Myphone Self-Service User Portal
Receive Voice Mail via Email
Public SIP ID for Extensions
3CX Tunnel for Easy Remote Connections
Advanced forwarding rules based on caller ID, time & type of call
Integrate Branch Offices with 3CX Bridge
Standards-based Presence Information
Integrated Fax Server
Receive Faxes via Email as PDF

3CX VOIP Client
Compact Windows System Tray Applet
Tunnel all VOIP Traffic over a Single Port
Place Calls
Transfer Calls
Shows Incoming Calls
Shows Caller ID
Shows Personal Call History
Divert Calls to Voice Mail
TAPI Driver for Integration with Microsoft Outlook
Queue Monitoring
Shows Status of Other Extensions
Run as Presence Monitor in Combination with Deskphone

3rd Party Application Integration
Microsoft Outlook
Salesforce Integration
HTTP API to Integrate with any Web CRM
Microsoft Exchange 2007 UM

SIP Standards Support
Fully Supports RFC 3261
SIP Forking
Establish Standards-based SIP Trunks with other SIP Servers

Devices and Providers
Supports SIP Hardware Phones
Supports SIP Software Phones
Supports Leading SIP / VOIP Gateways
Supports Sangoma cards
Supports Popular SIP /VOIP Providers
SIP Trunking Support
Create Free Communication Links to other 3CX Systems
Create Free Communication Links to other SIP Servers

Codecs (Voice Compression)
G711 (a law and u law)
GSM
Speex
Ilbc
G729 *1

Customer Service and Support
Wiki
Community Forums (no 3CX Support)
Email Support *2
Live Chat Support*3
3CX Partner Forum (only for 3CX Resellers)
3CX Partner Support Portal (only for 3CX Resellers)

1. The Mini Edition includes two G729 channels, the Small Business Edition includes 4 sim G729 calls, The Pro Editions 8 and the Enterprise Editions 16
2. Requires a support package
3. Requires a support package