asterisk users - May 2010 - How to get ConfBridge user count

I want to set up a conference call to be recorded automatically, so
I'd like the recording to start when the second caller joins the
conference (one caller already there).  The recording would continue
until the last user hangs up.

How can you determine how many are already in the conference bridge?

[conferences]
exten => 66,1,Answer
exten => 66,n,Wait(1)
exten => 66,n,Authenticate(123456)
;
exten => 66,n,NoOp(-- ConfBridge 66 user count: ${count} --)
;<-- WHAT VARIABLE TO USE HERE?
;
exten => s,n,Set(MONITOR_EXEC=/etc/asterisk/monitor_exec.sh)
exten => s.,n,Set(DATETIME=${STRFTIME(${EPOCH},,%C%y-%m%d-%H%M)})
exten => s,n,ExecIf($[${count}
1]?Monitor(wav,record-${CALLERID(num)}-${DATETIME},bm))
;
exten =>66,n,ConfBridge(66,Ms)
exten => 66,n,Playback(goodbye)
exten => 66,n,Hangup

Thanks for any info.

On Tue, 2010-05-25 at 12:07 -0600, Steve Johnson wrote:
> How can you determine how many are already in the conference bridge?
I don't know that there's a way to do it automagically within
ConfBridge.  I use the GROUP() and GROUP_COUNT() functions to do these
sorts of things.

--
Jared Smith
Digium, Inc.