[asterisk-users] parsing issue

[Eric Wieling]

Have you tried the MATH() function?

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of CDR
Sent: Wednesday, May 02, 2012 1:48 PM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] parsing issue

I get an error when I execute this code
exten => rejected,n,Hangup($[-1*${Z}])

May  2 13:42:09] WARNING[23128]: ast_expr2.fl:468 ast_yyerror:
ast_yyerror():  syntax error: syntax error, unexpected $end, expecting '-' or '!' or '(' or '<token>'; Input:
-1*

The variable "Z" has a  negative number, which is the code that I need to use in the hangup.
Any idea how can I do this? There is no ABS() function in Asterisk. I already filed a request for it but it turns up that it will cost me money. How can I remove the sign from a number?
Philip

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