Realms based on called-station-id

[Tim King]

I am trying to direct users on the same nas to different realms based on 
the called-station-id I have tried the following wtihout success.  if 
("%{Called-Station-Id}") == "6165551212" { update 
control{Proxy-To--Realm == myrealm}} Can anyone see what is wrong wtih 
the syntax in that?
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