Snap is a cutting edge dialer and call pop up application for Asterisk and other IP PBX's that is flexible and powerful.
Snap works by sending the phone number you wish to dial to your PBX and initiating a call back to your phone. Once your phone rings you pick it up and it will be connected to the number you dialed.
For Outlook users, the call pop-ups are tightly integrated.The flexibility comes from it's Multi-Connection technology. If you travel between work and home, or would like to have seperate settings for different situations then this feature will be extremely useful for you. You simply dial via a different connection by using the "arrow" to the right of the Dial button to access these connections.
The latest version of the product (0.7) adds TAPI (in the Pro version $29.95) and eyeBeam 1.5 integration.
Link to their web site: http://www.snapanumber.com/