Hi, I'm trying to add some header on Transmit Data thanks to the callback call_on_tsx_state_changed from a module session invite, but when I see the trace of my SIP message, there aren't any modification : No Subject Header. static void call_on_tsx_state_changed( pjsip_inv_session *inv, pjsip_transaction *tsx, pjsip_event *e ){ /*pjsip_tx_data *tdata; pjsip_generic_string_hdr *hsubject; pj_str_t name; pj_str_t value; name = pj_str("Subject"); value = pj_str("PJSIP_UA"); puts("Subject"); puts("PJSIP_UA"); if(e->type == PJSIP_EVENT_TX_MSG) { tdata = e->body.tx_msg.tdata; hsubject = pjsip_generic_string_hdr_create(tdata->pool, &name, &value); pjsip_msg_insert_first_hdr(tdata->msg, (pjsip_hdr*) hsubject); }*/} I have tried pjsip_msg_add_hdr too. I use simpleUA example and the following page to do my code. http://trac.pjsip.org/repos/wiki/SIP_Message_Buffer_Event#GettingtheSIPMessagefrompjsip_event May be there is a bug ? Thanks by advance for responses. C?dric. _________________________________________________________________ Installez gratuitement les 20 ?m?ticones Windows Live Messenger les plus fous ! Cliquez ici ! http://www.emoticones-messenger.fr/ -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080917/3e9706b8/attachment.html