I try to use cond in my dialplan <condition field="destination_number" expression="^(1111)"> <action application="answer"/> <action inline="true" application="set" data="b=25"/> </condition> <condition field="${cond(${b} > 12 ? YES : NO)}" expression="^YES$"> <action application="log" data="ALERT ${b} is indeed greater than 12"/> <anti-action application="log" data="ALERT ${b} is not greater than 12"/> </condition> it's work but when use set b=${b1} it's not work <condition field="destination_number" expression="^(1111)"> <action application="answer"/> <action inline="true" application="set" data="b1=25"/> <action inline="true" application="set" data="b=${b1}"/> </condition> <condition field="${cond(${b} > 12 ? YES : NO)}" expression="^YES$"> <action application="log" data="ALERT ${b} is indeed greater than 12"/> <anti-action application="log" data="ALERT ${b} is not greater than 12"/> </condition> What's wrong ? inline or cond ? Dome C.