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Some SBCs require responses to empty SIP INFO packets after establishing call via INVITE, if not responded to they may drop your call after unspecified timeout of X minutes. They are identified by having no Content-Type, check for this and respond with 200 - OK message. ASTERISK-24986 #close Reported-by: Ilya Trikoz, Federico Santulli Change-Id: Ib27e4f07151e5aef28fa587e4ead36c5b87c43e0
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2016, Digium, Inc.
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*
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* Bradley Latus <brad.latus@gmail.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*** MODULEINFO
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<depend>pjproject</depend>
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<depend>res_pjsip</depend>
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<depend>res_pjsip_session</depend>
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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ASTERISK_REGISTER_FILE()
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#include <pjsip.h>
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#include <pjsip_ua.h>
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#include "asterisk/res_pjsip.h"
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#include "asterisk/res_pjsip_session.h"
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#include "asterisk/module.h"
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static void send_response(struct ast_sip_session *session,
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struct pjsip_rx_data *rdata, int code)
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{
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pjsip_tx_data *tdata;
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pjsip_dialog *dlg = session->inv_session->dlg;
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if (pjsip_dlg_create_response(dlg, rdata, code, NULL, &tdata) == PJ_SUCCESS) {
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struct pjsip_transaction *tsx = pjsip_rdata_get_tsx(rdata);
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pjsip_dlg_send_response(dlg, tsx, tdata);
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}
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}
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static int empty_info_incoming_request(struct ast_sip_session *session,
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struct pjsip_rx_data *rdata)
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{
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if (!rdata->msg_info.ctype) {
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/* Need to return 200 OK on empty body */
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/* Some SBCs use empty INFO as a KEEPALIVE */
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send_response(session, rdata, 200);
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return 1;
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}
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/* Let another module respond */
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return 0;
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}
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static struct ast_sip_session_supplement empty_info_supplement = {
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.method = "INFO",
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.priority = AST_SIP_SUPPLEMENT_PRIORITY_LAST,
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.incoming_request = empty_info_incoming_request,
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};
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static int load_module(void)
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{
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CHECK_PJSIP_SESSION_MODULE_LOADED();
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ast_sip_session_register_supplement(&empty_info_supplement);
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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ast_sip_session_unregister_supplement(&empty_info_supplement);
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Empty INFO Support",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND,
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);
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