Hillol,
I forgot to ask you if you have the quintum registered to another gatekeeper or not. Sroutes only work on the Quintum if it is not registered to a gatekeeper, only to itself. If this is true, then the rest of the configuration looks fine. Maybe the call is getting out to IP but the other end is rejecting the call? Do you know how to get a log of the call from the quintum?
If you want further direction on this, contact me at mike_voip@quintum.com.
Mike