asterisk users - May 2007 - Restricting membership to a queue?

I'm having some weird problem with asterisk (trixbox).

I've set it up as a pbx for a small call center with 4
main queues. It usually works great, until for some
reason I still don't fully understand the extension
the users dial in to register to a queue becomes a
queue member itself :/

So what happens after that is when all the operators
are busy taking calls and a new call gets in, the
caller gets the message asking them to register into
the queue (because the wrong extension gets the call
since it's treated as a free agent)

Here's an example:

Let's suppose the queue is "123" and the users dial in
to "123*" in order to become members of such a queue.
When that weird thing happens you see things like
this:

asterisk1*CLI> show queue 123
123          has 0 calls (max unlimited) in
'leastrecent' strategy (4s holdtime), W:0, C:4, A:0,
SL:0.0% within 0s
   Members:
      Local/3338@from-internal/n (dynamic) (Unknown) 
      Local/123*@from-internal/n (dynamic) (Unknown)
   No Callers

Is there a way to prevent this from happening? Is
there a way to set up a whitelist so only good known
extensions can become a member?

Any help would be greatly apreciated


Fer


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