I'm continue my job to 'migrate' my 3.3.1 kamailio.cfg script on a RHEL 6.2 
server to the 5.0.x kamailio version on a RHEL 7.1 server, and I encounter a 
major problem with the '== $null' test in the script.

My original script (3.3.1) contains this sequence :

        $var(i:maxRangeInx) = $sht(mbxrangeHash=>"maxrange");
        xlog(" imbxRangeInx value before test : '$var(i:maxRangeInx)' ");
        if ($var(i:maxRangeInx)==$null) {
        xlog(" imbxRangeInx after test : '$var(i:maxRangeInx)' ");

==> The results are :
imbxRangeInx value before test : '0'
imbxRangeInx value after test : '99'

I run the same script on my new server and I get '0' before and after the test.

I attempted another kind of test to try to figure out where the problem is. So 
I write the simple test (with kamailio 5.0.x) :

        $var(i:maxRangeInx) = $sht(mbxrangeHash=>"maxrange");
        $var(toto) = $null;
        if ($var(toto) == $null)
                xlog ("toto true");
                xlog ("toto false");

The result I got is always 'toto false'.

So it appears to me that the test '== $null' doens' that gives a good result 
with kamailio 3.3.1, doesn't return the same with kamailio 5.0.x.

That is a major issue for me and it let me confused about the possibility to 
move to kamailio 5.0.x.

Have people an idea / explanation, why this issue ?


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