Asterisk and Spark

Hi

Sorry to post a new thread, but wanted to knw how asterisk wildfire spark combo works. I have already installed asterisk and wildfire on my redhat el3 machine (single server), and my end clients are all win xp sp2 boxes who can easily chat conference using wildfire. Now i want to use asterisk as well with spark and wildfire.

My extension numbers are recognized on wildfire and i have added a couple of users, but cant seem to get the hang of how will i make or receive calls, cause i cant see any dialer in spark as such, do i have to use a softphone which will be by default integrated with asterisk, or is it spark with some magical inbuilt utility???

still testing and wondering

Regards

Hrishi