SCCM 2007 with some domains

Hi
I hope somebody help me, I need to add or join some computers from the other
domains in my SCCM 2007.
My SCCM is installed in domain example1.com and the computers of the other
domains is example2.com is possible add or enter the second domain computers
on my sccm
Between the domains are not trusted relationship
How to make this?

Thanks for your help

Javier Montero