<p>Same results when used UDP transport on caller and callee legs.<br>
And when <code>set_body_multipart</code> is applied at start of <code>request_route</code> block</p>
<pre><code>/* 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")) {
                set_body_multipart("test", "text/plain", "delimiter");
                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");
        }                           
                                       
        # per request initial checks     
        route(REQINIT);  
</code></pre>

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