I have tested two cases on reference config with loaded textopsx.so enabled roles.

+#!define WITH_DEBUG
+#!define WITH_MYSQL
+#!define WITH_AUTH
+#!define WITH_USRLOCDB

First case works as expected

/* Main SIP request routing logic
 * - processing of any incoming SIP request starts with this route
 * - note: this is the same as route { ... } */                     
request_route {                                                                
        if (is_method("INVITE") && has_body("application/sdp")) {
                set_body_multipart("delimiter");
                if (msg_apply_changes()) {
                    $var(b) = "7e Od 04 55 75 69 20 4d 61 6b 65 43 61 6c 6c";
                    append_body_part("$var(b)", "application/vnd.cirpack.isdn-ext", "signal;handling=required");
                    if(msg_apply_changes()) {
                        xlog("L_INFO", "Body converted Succesfully $rU \n");
                    }   
                }
        }

Second is generated core dump

/* Main SIP request routing logic
 * - processing of any incoming SIP request starts with this route
 * - note: this is the same as route { ... } */                     
request_route {                                                                
        if (is_method("INVITE") && has_body("application/sdp")) {
                set_body_multipart("delimiter");
                if (msg_apply_changes()) {
                    $var(b) = "7e Od 04 55 75 69 20 4d 61 6b 65 43 61 6c 6c";
                    append_body_part("$var(b)", "application/vnd.cirpack.isdn-ext", "signal;handling=required");
#                    if(msg_apply_changes()) {
#                        xlog("L_INFO", "Body converted Succesfully $rU \n");
#                    }   
                }
        }

Looks as kamailio generate core dump when added multipart and not called msg_apply_changes() in call processing.

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