[Serusers] Ser2 and radius - Accounting request doesn't send User-Name Attribute

Hi, I am using radius for accounting and I have the following problem that whenever SER sends an Accounting message to Radius which contains the Acct-Status-Type = Start it doesn't send the User-Name attribute. Strange is that the User-Name is send with the massage with Acct-Status-Type = Stop. This disables radius to perform the correct accounting statistics because radius is unable to map the start and end of the session. Can it be somehow enabled in ser to send User-Name parameter in the first message? Below is an example of such two corresponding accounting messages: Mon Mar 12 14:46:17 2007 SER-Attr = "" Acct-Session-Id = "9e6a674c-0fcf-db11-94ea-00148539376e@sen" Sip-To-Tag = "36974326" SER-From = "\"Sen Server\" <sip:tzl@voip.touk.pl>;tag=406e674c-0fcf-db11-94ea-00148539376e" SER-Flags = 8 SER-Original-Request-ID = "sip:110@voip.touk.pl" Sip-Method = "INVITE" Sip-Cseq = 2 Sip-Translated-Request-ID = "sip:hellboy@192.168.0.105:7060" Sip-Source-IP-Address = 192.168.0.165 Sip-From-Tag = "406e674c-0fcf-db11-94ea-00148539376e" SER-To = "<sip:110@voip.touk.pl>;tag=36974326" SER-Digest-Username = "tzl" SER-Request-Timestamp = 1173707170 Calling-Station-Id = "sip:tzl@voip.touk.pl" Sip-Source-Port = 5067 SER-Digest-Realm = "voip.touk.pl" Sip-Response-Code = 200 Called-Station-Id = "sip:110@voip.touk.pl" SER-Response-Timestamp = 1173707177 Acct-Status-Type = Start Service-Type = IAPP-Register NAS-Port = 5060 Acct-Delay-Time = 0 NAS-IP-Address = 127.0.0.1 Acct-Unique-Session-Id = "16bd1ddc2a514fa0" Timestamp = 1173707177 Mon Mar 12 14:47:10 2007 SER-Attr = "" Acct-Session-Id = "9e6a674c-0fcf-db11-94ea-00148539376e@sen" Sip-To-Tag = "36974326" SER-From = "\"Sen Server\" <sip:tzl@voip.touk.pl>;tag=406e674c-0fcf-db11-94ea-00148539376e" SER-Flags = 8 SER-Original-Request-ID = "sip:hellboy@192.168.0.105:7060" Sip-Method = "BYE" Sip-Cseq = 4 Sip-Translated-Request-ID = "sip:hellboy@192.168.0.105:7060" Sip-Source-IP-Address = 192.168.0.165 Sip-From-Tag = "406e674c-0fcf-db11-94ea-00148539376e" SER-To = "<sip:110@voip.touk.pl>;tag=36974326" SER-Request-Timestamp = 1173707230 Calling-Station-Id = "sip:tzl@voip.touk.pl" Sip-Source-Port = 5067 Sip-Response-Code = 200 Called-Station-Id = "sip:110@voip.touk.pl" SER-Response-Timestamp = 1173707230 Acct-Status-Type = Stop Service-Type = IAPP-Register User-Name = &quot;tzl(a)voip.touk.pl&quot; NAS-Port = 5060 Acct-Delay-Time = 0 NAS-IP-Address = 127.0.0.1 Acct-Unique-Session-Id = "4a9f1334616db4a4" Stripped-User-Name = "tzl" Realm = "voip.touk.pl" Timestamp = 1173707230