On Wed, Oct 28, 2009 at 3:18 PM, Daniel-Constantin Mierla &lt;miconda(a)gmail.com <mailto:miconda@gmail.com>> wrote: On 28.10.2009 10:37 Uhr, Chandrakant Solanki wrote: 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] what processing are you doing in kamailio for this case? Do you do same failure routing to another destination if B does not answer? Such error occurs when r-uri is changed in failure route but no append_branch() was executed. Cheers, Daniel hi where could i put this thing.... Here is my config file for kamailio... http://pastebin.com/m34e07510 Please help me out ...