[asterisk-users] How to input NULL in CDR report

[Satria Anamarta]

Hi all,
In the CDR report I would like to filter search to display all the calls
that has a null value (blank) for the "Dst. Channel" field.
I try to input space, <null>, $null$, but it display error. Just left the
field blank will display ALL.

So what is the correct value to be inputted as null or blank?

Thanks for the help :)

BR,
Anam.
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