[SR-Users] Branches Routes

Hello, We have a main route where we try multiple destinations (SIP Providers) one by one in case of failure. We modify the $ru in branch routes. I have to manipulate the $rU in the main route (adding 000 and strip 000) to create the second branch. Otherwise I have an error in Kamailio , is it expected ?? Feb 16 10:29:13 proxy2 /usr/sbin/kamailio[3837]: NOTICE: RU => 0003280033800 (Branch 0) * Adding 000 in main route Feb 16 10:29:13 proxy2 /usr/sbin/kamailio[3837]: NOTICE: RU => 3280033800 (Branch 0) * Strip "000" in main route * Timeout of first provider (going to main route again with an other branch) Feb 16 10:29:15 proxy2 /usr/sbin/kamailio[3840]: NOTICE: RU => 0003280033800 (Branch 1) Feb 16 10:29:15 proxy2 /usr/sbin/kamailio[3840]: NOTICE: RU => 3280033800 (Branch 1) * Call OK I will now remove the prefix & strip command in main route Feb 16 10:32:11 proxy2 /usr/sbin/kamailio[3951]: NOTICE: RU => 3280033800 (Branch 0) Feb 16 10:32:11 proxy2 /usr/sbin/kamailio[3951]: NOTICE: RU => 3280033800 (Branch 0) Feb 16 10:32:11 proxy2 /usr/sbin/kamailio[3951]: NOTICE: Branch to sip:3280033800@XXXXXXXXXXX * Timeout Feb 16 10:32:13 proxy2 /usr/sbin/kamailio[3955]: NOTICE: RU => 3280033800 (Branch 1) Feb 16 10:32:13 proxy2 /usr/sbin/kamailio[3955]: NOTICE: RU => 3280033800 (Branch 1) Feb 16 10:32:13 proxy2 /usr/sbin/kamailio[3955]: ERROR: tm [t_fwd.c:1728]: t_forward_nonack(): no branches for forwarding Feb 16 10:32:13 proxy2 /usr/sbin/kamailio[3955]: ERROR: tm [tm.c:1548]: _w_t_relay_to(): t_forward_noack failed Feb 16 10:32:13 proxy2 /usr/sbin/kamailio[3955]: ERROR: sl [sl_funcs.c:362]: sl_reply_error(): stateless error reply used: I'm terribly sorry, server error occurred (6/SL) Any suggestions ?