asterisk users - Oct 2008 - Mobile (cell) phone in a queue (but act like an agent

Hi,
   I need a way to have mobile phones in a queue and have to press a key when
picking up the phone (to thwart answer phones) before transfering.

What I've built so far is as follows but unfortunately if the mobile number
picks up the call is immediately bridged.

extensions.conf
;Announce the wait
exten => s,1,Playback(notices/take_time_to_answer)

;Call the queue with just the desk phones in it
exten => s,2,Queue(allQueue,n)

;Dynamicly Add queue members
exten => s,3,AddQueueMember(allQueue|IAX2/Asterisk-1 at
uplink/07811111111<mailto:allQueue|IAX2/Asterisk-1 at uplink/07811111111>)

;Call queue again now the remote people have been added to the queue
exten => s,4,Queue(allQueue,tn)

queues.conf
[allQueue]
announce =  queues/general_announce
timeout=30
retry=4
maxlen = 0
announce-frequency = 0
announce-holdtime = no

;Desk Phones
member => SIP/DeskPhone1
member => SIP/DeskPhone2
member => SIP/DeskPhone3

Any suggestions / dial plan work arounds?

Gareth
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