I am trying to decipher a kamailio.cfg file for a particular open source project.

There are problems with authentication and I am trying to understand why.

They use the following lines for authentication check

if (!auth_check("$fd", "subscriber", "0")) {
            auth_challenge("$fd", "0");
            exit;

The documentation only talks about using "1" and not "0". So I am trying to understand what the above statement with "0" is actually doing. Any help in this regard would be greatly appreciated.

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