From: Valentin Nechayev <[EMAIL PROTECTED]>

   '200 Auth failed' is common method to allow human hearable error
   message on real call with UAs which can't detailedly describe
   error (most often for ATAs). UAs will think it's registered and
   allow outgoing call, which will be rejected with voice
   description. This is likely the main need to use such crutch but
   this is strong needed crutch.

Why is a crutch needed?  The UA need not register in order to make an
outgoing call -- registration and being able to make an outgoing call
are completely unrelated.

Dale
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