This may be related to log
16(27) ERROR: {1 21 INVITE 1851253425} <core> [core/msg_translator.c:3290]: sip_msg_apply_changes(): cannot apply msg changes after adding record-route header - it breaks conditional 2nd headerThink in this case must be send original INVITE.
Hi. You need to do record_route() after convert body to multipart. I have this case in production. ``` if( is_method("INVITE") && has_body("application/sdp")) { if (msg_apply_changes()) { xlog("L_INFO", "ISUP 0 Changes Applied Succesfully"); } set_body_multipart(,"2123894789_1257887457"); if (msg_apply_changes()) { xlog("L_INFO", "ISUP 1 Changes Applied Succesfully"); } append_body_part_hex("01 10 48 00 0a 00 02 09 07 03 90 90 13 71 32 20 0a 04 02 13 73 12 00","application/isup;version=itu-t92+","signal;handling=optional"); if(msg_apply_changes()) { xlog("L_INFO", "ISUP 2 Changes Applied Succesfully $rU \n"); } record_route(); } ```