Getting Call Boxes to Auto Ring

@kbocek wrote:

I picked up a couple of cool Bogden door phones. They connect as a standard phone through an FXS port. I get a dial tone when I press the button on the front. I can use the auto-answer feature to call the box.

I'm trying to get the box to ring the system when it goes off hook. This is the same thing as a "lobby phone" that dials an operator when taken off hook. What I've got right now is the extension set to "callboxes" and a custom context in extensions_custom.conf:

;Set context of callbox extensions to this
;Dial ring group 21
[callboxes]
exten => s,1,Answer()
exten => s,n,noop(=== DISTINCTIVE RING TONE ===)
exten => s,n,SIPAddHeader(Alert-Info:;info=ring2) ; use either ring1, ring2 or ring3
exten => s,n,Goto(from-internal,21,1)
exten => s,n,Hangup()

But the call box just gives a dial tone and does not dial ring group 21. What am I missing?

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