howto stop one connection and start another

[Spacelee]

i use pptp and freeradius2+mysql
the situation is :
there is a user it set to be Simultaneous-Use := 1

when he login in his ipad, he watch some movie, then he want to login in his
iphone, how can i stop his original connection and start another connection
in freeradius?
-- 
Spacelee
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