The pjsua on_incoming_call callback is passed a pjsip_rx_data*.? rdata->msg_info.msg is a pjsip_msg*,
and you can loop through the headers with a loop like this:
??? pjsip_hdr *hdr ;
??? for (hdr = m->hdr.next ; hdr != &m->hdr ; hdr = hdr->next) {
??? }
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