Please see  in http://www.kamailio.org/wiki/cookbooks/4.2.x/pseudovariables

$_s(format) - Evaluate dynamic format

$_s(format) - returns the string after evaluating all pseudo-variables in format

    $var(x) = "sip:" + $rU + "@" + $fd;

    # is equivalent of:
    $var(x) = $_s(sip:$rU@$fd);
BR


On Fri, May 29, 2015 at 2:40 PM, ycaner <yasin.caner@netgsm.com.tr> wrote:
Hello;
 it works both ways.  Could you explain what i did here?


$rU=*$_s*($avp(i:69)$rU);
$rU=*$_s*($avp(s:69)$rU);

Thanks.



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