Thanks for reply, I have tried the new one and did transfer back
but it still dont work, when I was posting this question again with my test commands.
suddenly I found out what the problem it is.

the variable cannot with number in it, like:

work: 
<action application="set" data="var=1"/>  
<action application="set" data="var=${expr(${var}+1)}"/>
fail:    
<action application="set" data="var1=1"/> 
<action application="set" data="var1=${expr(${var1}+1)}"/>


2010/1/13 Michael Jerris <mike@jerris.com>
Remember you can't do conditions on these vars being set unless you transfer back into the dialplan as these actions are not run immediately, but rather after dialplan parse, unless you use http://wiki.freeswitch.org/wiki/Dialplan_XML#Inline_Actions

Mie

On Jan 12, 2010, at 12:39 PM, Sergey Okhapkin wrote:

> <action application="set" data="var=${expr(${var}+1)}"/>
>
> On Tuesday 12 January 2010, Chia-Yen Wu wrote:
>> Hello everyone,
>> Is there anyway to calculate number in dialplan.xml?
>>
>> like example:
>> <action application="set" data="var=1"/>
>> and with an action , I can do : var=var+1
>>
>> I have tried mod_expr, but failed to catch the variable, like below:
>> <action application="set" data="var=${expr($var+1)}"/>
>


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