[Help-gnu-radius] Admin assisstance

[neener]

I am running a Radius server using Gnu Radius and I am having trouble with 
checking for multiple dial-up connections.  The dial-up service I obtain 
through another company that uses Cisco 5800 AS.  The default installation does 
not support this type of access server and so it does not get the response back 
on whether or not the user is already connected.  How do I go about determining 
how the request is supposed to be formatted and how the response is going to be 
formatted?  And then how do I get this information into the Radius 
configuration so that it can use it?