mmmm hehe, well, there is indeed a way to do what you want. Mobility would be the best choice but what you can do is create a secret extension to which a user can transfer and have that extension be a call system transfer. of course only the ones that need to do that would be aware of that. you can create it on a main call handler and assign it a number (just don't tell any of that in the greeting)
the other way is a little more complicated, the user dials in, logs into his subscriber, changes the call transfer number, then attempts to transfer to himself again and the call transfer needs to be set to "yes, ring subscriber at this extension" for this to work. it's more complicated than just hiding an entry for a call system transfer within a menu.
of course the way to avoid any toll fraud from any guy that reads this =) would be to limit the access from unity to the partitions that reach the outside and the restriction tables on unity.
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