URL Rewrite to subdomain

I have one case working well the rewrite  

http://www.mydomain.com/fixo/variable1/variable2   -->http://www.mydomain.com/view.asp?a=variable1&b=variable2

the line URL View is http://www.mydomain.com/fixo/variable1/variable2

BUT

When i try for a "rewrite" subdomain in another server the "rewrite" is no working,  Only working with "Redirect" but the line URL VIEW is

http://teste.mydomain.com/view.asp?a=variable1&b=variable2   and i need  http://www.mydomain.com/fixo/variable1/variable2 

Please Help-me.

Thanks,

MArcelo