[Serusers] how to get call duration in radius accounting stop

[Kamran Ahmad]

hi

how to get call duration in radius. there should be
callduration in accounting stop but here in my case
there is no callduration


 Acct-Status-Type = Stop
        Service-Type = Sip-Session
        Sip-Response-Code = 200
        Sip-Method = 8
        User-Name = "4000 at ser"
        Calling-Station-Id = "sip:4000 at ser"
        Called-Station-Id = "sip:3000 at ser"
        Sip-Translated-Request-URI = "sip:3000 at ser"
        Acct-Session-Id =
"CB13EC9C-9DB4-420F-BEF4-786E6398D714 at UA"
        Sip-To-Tag = "as23df87de"
        Sip-From-Tag = "290015013442"
        Sip-Cseq = "2"
        NAS-IP-Address = 127.0.0.1
        NAS-Port = 5060
        Acct-Delay-Time = 0
        Client-IP-Address = 127.0.0.1
        Acct-Unique-Session-Id = "ca12eca5fce40009"
        Timestamp = 1112912023

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