Hi Call Sequence is ... Client A/B register on Kamailio and both are registered successfully.. Firewall is stopped. Now... Client A call to Client B.. Client A => Kamailio => Asterisk => Kamailio => Client B Above is call sequence, when call goes from Asterisk to Kamailio ... then found below error.... ERROR:tm:t_forward_nonack: no branch for forwarding Oct 28 02:14:07 openser1 /sbin/kamailio[2915]: ERROR:tm:w_t_relay: t_forward_nonack failed Oct 28 02:14:07 openser1 /sbin/kamailio[2915]: ***** OUT route[8] -- Regards, Chandrakant Solanki