How to send SIP message peer to peer to UA

Hello,

I was  wondering if there is a way to send a message directly to some
some UA e.g, sip:abc@host1.

The problem that I am facing is as follows:
	
I set the javax.sip.OUTBOUND_PROXY to some proxy server using the
following call properties.setProperty("javax.sip.OUTBOUND_PROXY",proxy);

So, the SipStack which is created everytimes sends the request to the
proxy even when the request URI contains the user@hostname.

If  I want to send SIP messages directly to end points - how can I do that ?

Thanks a lot for your help.

Regards,
Vishal