asterisk users - Jul 2014 - Gotoif($[${LEN(${CALLERID(number)})} != 4]?true) doesn't work...

Greetings,

I'm hoping that an extra pair of eyes might help me to solve a challenge...

Anyone have any idea why the following would not work?  I'm trying to test
for a callerid value that is 4 digits in length..



exten => s,1,NoOp(CLID is ${CALLERID(all)})
exten => s,n,Gotoif($[${LEN(${CALLERID(number)})} != 4]?true)
exten => s,n,NoOp(Value is False)
exten => s,n,Hangup
exten => s,n(true),NoOp(Value is True)
exten => s,n,Hangup
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Positively Optimistic wrote:
> Anyone have any idea why the following would not work?  I'm trying to 
> test for a callerid value that is 4 digits in length.. 
Differences between yours and mine:

Yours:
Gotoif($[${LEN(${CALLERID(number)})} != 4]?true)

Mine:
Gotoif($["${LEN(${get-admin-password})}" < "1"]?2:4)

Doug