asterisk users - Apr 2006 - Dial two extensions at the SAME time and connect them when possible

Hi,

I want to start call between A and B. Currently call can be triggerred with 
either first calling A or B number and then the other number after fist 
picks up.

I'd like to call A and B at the same time and connect them in call when 
possible...

One way would probably be with putting both calls in conference, but maybe 
there is some more elegant way of doing it?

Also is there any specific reason why calls are triggered so only one client 
is called and then the other ?

Thanks ,

regards,

Rob.