I'm trying to use Asterisk's B2BUA with Openser. However I read somewhere that Asterisk can't handle as much concurrent calls as Openser can with SIP. So that's why I am trying to use both of them together. This is gonna be somewhat I'm trying to do: UA ----->Openser ---> Asterisk ------> PSTN Gateway or SIP All UA should be regisetered on Openser using mysql database. Question is, if I use this implementation, wouldn't all the call load be on Asterisk instead of Openser? Maybe I'm getting the wrong picture, as I'm fairly new to this. So I appreciate as much help as possible. I'm trying to do this for my senior design. Thank you. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com