fredposner left a comment (kamailio/kamailio#4409)
$var variables cannot be null. (They are always 0 if not defined). In the spec,
it says:
> This transformation outputs valid SQL values for various PV values:
>
> - \ values are output as NULL
> - integers are output as integers
> - everything else is output as quoted and escaped string
So this seems expected. I would assume if $var(foo) was set to `1` is would
also output as an integer.
Have you tried with an $avp or other variable with $null?
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