How to allow nas'es to serve only groups of clients?

[Alexander Yu. Solodukhin]

Hi. I have two types of nases: 1) hotspots 2) vpn servers. I need vpn  
nases authorize only vpn users and hotspot nases authorize only hotspot  
users. How can i divide users into several groups and reject vpn accounts  
to login through hotspot and vice versa? I think i must use huntgroups and  
unlang, but not cleanly understand how.

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ISP CrIS, Softwarium