See also the linked bug for detailed descripton.

Calling a remote SLSB does not work, if the equally named SLSB is deployed on the calling JBoss.

See also:
http://www.jboss.com/index.html?module=bb&op=viewtopic&t=96098
and
http://jira.jboss.com/jira/browse/EJBTHREE-823

and numerous other topics on this.
In my opinion, ther should be an easier way to do this, instead of writing your own interceptor, patching JBoss or the like.
Also, in a non clustered environment, if you give a hostname to the InitialContext(), you should get the remote server session beans,
regardless of possibly locally deployed equally named stateless sessionbeans.