asterisk users - Apr 2005 - Queuing with busy detect

Hello All,
I have a setup I would like to try as such:
Call comes in.
Rings to a sip extension, if busy, goes to menu
If not busy, follows other procedures.

My question is, I want asterisk to ring 3 extensions simultaneously, but
if the first one is busy, to put the call into a queue.

This is for example, I am the only one answering calls, but at three
places. I want asterisk to know that if I am on the phone, to skip the
ringing, go into a menu, then an immediate queue.

If I use an & in the dial string, I do not get the busy status.

Thanks,
Greg

This is my current setup:

exten => ${ADCOMTELIAXNUM},1,SetVar(IncomingCID=${CALLERID})
exten => ${ADCOMTELIAXNUM},2,SetVar(IncomingLine=${EXTEN})
exten => ${ADCOMTELIAXNUM},3,SETCIDNUM(${CALLERIDNUM:2}) ;Set CID from
teliax minus +1
exten => ${ADCOMTELIAXNUM},4,Goto(adcomincoming,s,1)
exten => ${ADCOMTELIAXNUM2},1,SetVar(IncomingCID=${CALLERID})
exten => ${ADCOMTELIAXNUM2},2,SetVar(IncomingLine=${EXTEN})
exten => ${ADCOMTELIAXNUM2},3,NoOp("Cid already set")
exten => ${ADCOMTELIAXNUM2},4,Goto(adcomincoming,s,9)
exten => t,1,Goto(adcomincoming,s,1)
exten => s,1,Dial(${INCOMINGADCOM},15,t);Dial dest for 5 seconds
exten => s,2,GotoIf($["${DIALSTATUS}" = "BUSY"]?9:9)
exten => s,9,Wait(.5)
exten => s,10,Answer ; Answer the line
exten => s,11,NVBackGroundDetect(adcom/adcom-welcome); Thank you for
calling ADCOM Corp.
exten => s,12,NVBackGroundDetect(adcom/adcom-options)   
. . .
exten => 1,1,Playback(transfer)
exten => 1,2,Dial(SIP/302,20,tT)
exten => 1,3,GotoIf($["${DIALSTATUS}" = "BUSY"]?10:5)
;exten => 1,4,SetCallerID(ADCOM Emergency <800xxxxx>);
exten => 1,4,NoOp("No CID try to transpose")
exten => 1,5,GotoIf($["${IncomingLine}" =
"${ADCOMTELIAXNUM2}"]?7:6)
exten => 1,6,Dial(IAX2/xxxxx@teliax/1914xxxxxx,,Tt);infinite ring
;exten => 1,6,Dial(IAX2/xxx@voipjet/1914xxxxxx,,Tt)
exten => 1,7,VoiceMail(u${VOICEMAIL-AC})
exten => 1,8,Goto(s,2)
exten => 1,10,Playback(busy-pls-hold)
exten => 1,11,Queue(callqueue)