[Kamailio-Users] hangup problem

hi I am using.. Asterisk : 1.6.0.5 Kamailio : 1.5.0 Here, is network diagram ... 172.18.100.10/20/30 ============ 192.168.1.68 ========================== 192.168.1.70 (SIP Phone Register on this IP) (Kamailio IP) (Asterisk Server) And here link for kamailio file I have registered 111 and 222 user on asterisk (192.168.1.70)... and call to kamailio user (1212(a)domain.com)... call established successfully.. but sip phone is not hangup.. As well as i call from kamailio user like 1212 to 2121 ... call established .. but sip phone not hangup.. Help me out.... Thanks in advance -- Regards, Chandrakant Solanki