If you have quotes on one side of the = sign, then you need quotes on the other 
side.  In your dialplan line you are comparing + with "+".  A plus sign is not 
equal to quote plus sign quote

exten => _X., n, Set(CALLERID(num)=${IF($["${CALLERID(num):0:1}"  =  
"+"]?${CALLERID(num)}:0${CALLERID(num)})})

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Michael
Sent: Wednesday, May 02, 2012 12:20 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [asterisk-users] detecting intl. CLI with +

Hello asterisk users,

I need to convert the CLI received according to national/international format:

55-555-5555 to 055-555-5555 (add 0 in the beginning)
+55-55-555-5555 to +55-55-555-5555 (remains unchanged)

I put the following line in my dial plan:
exten => _X., n, Set(CALLERID(num)=${IF($[ ${CALLERID(num):0:1} = 
"+"]?${CALLERID(num)}:0${CALLERID(num)})})

But I get these error messages:
[May  2 17:05:43] WARNING[1494]: ast_expr2.fl:468 ast_yyerror: ast_yyerror():  
syntax error: syntax error, unexpected '+', expecting $end; Input:
 + = "+"
 ^
[May  2 17:05:43] WARNING[1494]: ast_expr2.fl:472 ast_yyerror: If you have 
questions, please refer to 
https://wiki.asterisk.org/wiki/display/AST/Channel+Variables
[May  2 17:05:43] WARNING[1494]: func_logic.c:192 acf_if: Syntax 
IF(<expr>?[<true>][:<false>])  (expr must be non-null, and either <true> or 
<false> must be non-null)
[May  2 17:05:43] WARNING[1494]: func_logic.c:193 acf_if:       In this case, 
<expr>='', <true>='+55555555555', and <false>='0+55555555555'

Can anyone suggest the proper syntax? I tried the + with no quotes, single 
quotes '+' and double quotes"+" and nothing worked.

Thanks


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