[SR-Users] Presence changes not seen for first time login

Hi All, I have Kamailio3.1 set up by following the steps mentioned here - http://kb.asipto.com/kamailio:presence:k31-made-simple. When i login two users via Jitsi and add each other,one user is not able to see the other user's presence changes.Below are the steps to reproduce - 1.Login user1@sipdomain via jitsi 2.Login user2@sipdomain vis jitsi 3.user1 adds user2,user2 receives the request and accepts it. 4.user2 adds user1. 5.Now any presence changes from user1 is visible to user2 But any changes from user2 is not visible to user1. This issue is resolved if the users re-login.Any ideas what could be the issue ? Also how do i see the complete SIP headers in kamailio log,is their a way to enable it ? Thanks, Swetha