sip proxy send call to Elastix to outbound route

[Terry]

Dear Sir,
My Elastix IPPBX is working Great ....Thanks
Now I have a problems is
I used both sip extension or iax extension through outbound route with E1 card is working ,softphone can send outside through E1 card
Now how to config with trunk or inbound route ?I want sip proxy send call --->Elastix -->E1 card ---->outbound call
How to do ?
Thanks