[SR-Users] how to string concatination

[Grant Bagdasarian]

Hello,

How do I concatenate a string to an avp variable?

$avp(s:caller) = $fU;
if($(avp(s:caller){s.substr,0,2}) != "00") {
       $avp(s:caller) = "00$avp(s:caller)";
}

This piece of code does not work as the value of $avp(s:caller) is "00$avp(s:caller)"

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