System message

How to restrict users from registering from different UAs (only accept from single UA)?

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At the admin-tool -> [Configuration] -> [SIP(General)]page -> [Authentication]
[Register] = on
[Auth-user=user in "To:" (Register)] = "yes"
[Auth-user=user in "From:" (Invite)] = "yes"
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• Rule-1: Accept if the user is not registered yet.
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  [Matching Patterns]
  $request = ^REGISTER
  $registered( To ) = false
  
  [Deploy Patterns]
  $action = register
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• Rule-2: Accept if the user's IP address is the same as previous one .
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  [Matching Patterns]
  $request = ^REGISTER
  $addr = (.+)
  $registeredaddr( To ) = %1
  
  [Deploy Patterns]
  $action = register
  ---------------------------------------

• Rule-3: Reject other requests.
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  [Matching Patterns]
  $request = ^REGISTER
  
  [Deploy Patterns]
  $action = 603
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