Hi Daryl,
I have never seen one doc that lists this type of feature comparison (too bad :(
There have been new features added in each release between CCM 3.2 and CCM 4.3 I have tried to pick out the releases that had the biggest changes since CCM 3.2. These would be CCM 3.3(4), CCM 4.1(3) and CCM 4.2(1)Have a look;
CCM 3.3.4 New and changed Information
Forced Authorization Codes and Client Matter Codes
Cisco WebDialer
Cisco IP Telephony Backup and Restore System (BARS)
New and Updated Phone Support
Extension Mobility Enhancements
Cisco Security Agent
Dialed Number Analyzer (DNA)
Image Authentication
NM-HDV2 and NM-HD Support for Cisco CallManager
Conferencing Enhancements
Block External To External Transfer Service Parameter
International Dial Plan
Calling Search Space Enhancements
Default Trace Level Changed for Cisco Database Layer Monitor Service
http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_release_note09186a008020027c.html#wp1319190
CCM 4.1.3 New and changed Information
http://www.cisco.com/univercd/cc/td/doc/product/voice/c_callmg/4_1/rel_note/413cmrn.htm#wp1708005
Cisco Unified CallManager Release 4.3(1), based on release 4.2(3), addresses the retirement of the MS Windows 2000 Operating System by enabling a migration of Cisco Unified CallManager to Windows Server 2003.
Because Cisco Unified CallManager Release 4.3(1) is based on release 4.2(3) refer to the Cisco Unified CallManager Documentation Guide for a list of documents that are related to Cisco Unified CallManager release 4.2 at the following URL:
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_documentation_roadmaps_list.html
CCM 4.2.x New Features
New and Changed Information for Cisco CallManager Features CCM 4.2
The following sections describe new and changed information related to Cisco CallManager features:
Multilevel Precedence and Preemption Enhancements
Device Mobility
Cisco CallManager Attendant Console and Call Pickup Limitation
** Call Pickup Notification
** Directed Call Park
IPMA Enhancements
Cisco Messaging Interface Enhancements
Call Forwarding Enhancements
Password Management Features
** Log Out of Hunt Groups
** Voice-Mail-Related Changes to Hunt List and Hunt Pilot
New MLPP Service Lockout Enterprise Parameter
Phone Button Template
Call Diagnostics and Voice Quality Metrics
Overlap Sending and Receiving for H.323 Gateways
SDL Traces
Cisco CallManager T1 CAS Hookflash Transfer Support
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/prod_release_note09186a00805f1470.html#wp2430214
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