ADM provides some great features:

• Automatic on-call volume reduction
• One click dial from clipboard (paste number onto tray icon)
• Integrated phonebook
• List/Redirect/Hangup all active calls
• One click call forward setup
• Bluetooth presence detection to redirect calls when you walk out of the office
• Pop up browser on incoming call (integrate with your CRM to auto load customers details when they call)
• Cisco phone integration (auto speakerphone)
• Slide-in popup on incoming call, with Answer(cisco only), Hold, Busy and Redirect buttons , CallerID and duration
• Lots more!

The main application:

These screenshots are quite outdated (I plan to release some new ones soon), but hopefull will give you a feel of what ADM is capable of

Tray icon and menu

On-call slide-in popup

Main phonebook

View a phonebook entry

Quick dial dialog

Preferences

Manager prefs

Extension setup

Audio setup (on-call volume reduction)

CRM Integration

Cisco setup

Bluetooth presence setup