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

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@ser" Calling-Station-Id = "sip:4000@ser" Called-Station-Id = "sip:3000@ser" Sip-Translated-Request-URI = "sip:3000@ser" Acct-Session-Id = "CB13EC9C-9DB4-420F-BEF4-786E6398D714@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 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com