[Freeswitch-users] Hello , about calculate numbers

[Chia-Yen Wu]

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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