[Serusers] CDR problem

Hi guys, I'm currently trying out CDRTool with ser for generating call detail records.Currently, I getting a problem in a single call session whereby when a user calls a certain destination and an invite is sent; if the called party does not reply in time, a reinvite is sent. However, both records are recorded in CDRTool, each having the same SIP Session. Why it this so? Shouldn't only one session be recorded? Session start time SIP caller In SIP destination Out Dur Price KBIn KBOut Status Codecs 4N 2005-05-05 18:32:22 1001(a)lab.test.com 1002(a)lab.test.com 00.07 Ok (200) Signalling information SIP Session: 000ded22-eeb20005-306b5b03-43a91caf(a)192.168.10.2 SIP Method: 1 from : SIP Status: Ok (200) DelayTime: (s) SIP From: sip:1001@lab.test.com SIP To: sip:1002@lab.test.com Start time (caller): 2005-05-05 18:32:22 Asia Start time (proxy): 2005-05-05 18:32:22 Asia Stop time (proxy): 2005-05-05 18:32:29 Asia Session duration: 00:07 SIP Proxy: 192.168.1.2 Next SIP hop: Billing Party: 1001(a)lab.test.com 5N 2005-05-05 18:32:21 1001(a)lab.test.com 1002(a)lab.test.com 00:08 Ok (200) Signalling information SIP Session: 000ded22-eeb20005-306b5b03-43a91caf(a)192.168.10.2 SIP Method: 1 from : SIP Status: Ok (200) DelayTime: (s) SIP From: sip:1001@lab.test.com SIP To: sip:1002@lab.test.com Start time (caller): 2005-05-05 18:32:21 Asia Start time (proxy): 2005-05-05 18:32:21 Asia Stop time (proxy): 2005-05-05 18:32:29 Asia Session duration: 00:08 SIP Proxy: 192.168.1.2 Next SIP hop: Billing Party: 1001(a)lab.test.com Kindly advise, Regards, YY