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.ca...@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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>
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