Here are a few good resources for compatibility and integration information between different VPN servers and implementations of IPsec:

http://www.ipsec-howto.org/t1.html
http://wiki.openswan.org/index.php/Openswan/Interoperate
http://www.novell.com/coolsolutions/appnote/8027.html
http://www.packtpub.com/openswan/book

If are having trouble integrating the Junxion Box into your VPN setup, Junxion support will work with you to determine a viable solution.