[Users] Openser as front end to Asterisk

Hello everyone, I've finally got openser working with mysql. Now I'm trying to integrate Openser with Asterisk. I read Asterisk at large. However I have a few questions: 1) It is said that openser as a front end to asterisk will enable more concurrent calls comparing to asterisk alone. How is that so? 2) If openser acts as a front end connecting all SIP calls, what is the role of asterisks? 3) Will the load of SIP calls be handled by openser alone? Or is it both asterisk and openser? I'm confuse with this, please help a newbie out here. Thank you in advance. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com