The ATLAS will accept inbound calls on either PRI. On the outbound PRI, make sure the OUT#ACCEPT is set to "$" (which is our wild-card to allow anything) with a Search of "Primary." The inbound PRI should either have an OUT#ACCEPT of "--" (in order to prevent any outbound calls on this PRI) or "$" with a Search of "Secondary." The search of "Secondary" indicates it should only be used once the "Primary" is either busy or out of service.
Hope this helps,
Thanks for the reply, your solution works.