[Serusers] query about routing

sir, I am aman sachdeva working in positive comsole on voip project. i am using ur server(sip express router) for trial. sir i need ur help to fulfill my requirement is that to add gateway, that means my client call using softphone and sip express router server , route that call to to x.x.x.x(ip). the server is install in other ip. such as clent---->dial a number using softphone(9891713625)----------->sip express royter server is install on y.y.y.y,add prefix and routing ip( xxxxx919891713625(a)x.x.x.x)-------->x.x.x.x(ip) server. i found a script file in ser0.9.6(scripts) folder serconf.sh and i run this file with the parameter dominname and routing ip. but it dosenot route to x.x.x.x(routing ip). could u please tell me where i can change in the source code or script file so that my call is routing to other server. thanks Regards Aman Sachdeva