1 files changed, 89 insertions, 0 deletions
diff --git a/res/res_pjsip_empty_info.c b/res/res_pjsip_empty_info.c
new file mode 100644
index 000000000..09109ba2c
--- /dev/null
+++ b/res/res_pjsip_empty_info.c
@@ -0,0 +1,89 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2016, Digium, Inc.
+ *
+ * Bradley Latus <brad.latus@gmail.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*** MODULEINFO
+	<depend>pjproject</depend>
+	<depend>res_pjsip</depend>
+	<depend>res_pjsip_session</depend>
+	<support_level>core</support_level>
+ ***/
+
+#include "asterisk.h"
+
+ASTERISK_REGISTER_FILE()
+
+#include <pjsip.h>
+#include <pjsip_ua.h>
+
+#include "asterisk/res_pjsip.h"
+#include "asterisk/res_pjsip_session.h"
+#include "asterisk/module.h"
+
+static void send_response(struct ast_sip_session *session,
+		struct pjsip_rx_data *rdata, int code)
+{
+	pjsip_tx_data *tdata;
+	pjsip_dialog *dlg = session->inv_session->dlg;
+
+	if (pjsip_dlg_create_response(dlg, rdata, code, NULL, &tdata) == PJ_SUCCESS) {
+		struct pjsip_transaction *tsx = pjsip_rdata_get_tsx(rdata);
+		pjsip_dlg_send_response(dlg, tsx, tdata);
+	}
+}
+
+static int empty_info_incoming_request(struct ast_sip_session *session,
+		struct pjsip_rx_data *rdata)
+{
+	if (!rdata->msg_info.ctype) {
+		/* Need to return 200 OK on empty body */
+		/* Some SBCs use empty INFO as a KEEPALIVE */
+		send_response(session, rdata, 200);
+		return 1;
+	}
+
+	/* Let another module respond */
+	return 0;
+
+}
+
+static struct ast_sip_session_supplement empty_info_supplement = {
+	.method = "INFO",
+	.priority = AST_SIP_SUPPLEMENT_PRIORITY_LAST,
+	.incoming_request = empty_info_incoming_request,
+};
+
+static int load_module(void)
+{
+	CHECK_PJSIP_SESSION_MODULE_LOADED();
+
+	ast_sip_session_register_supplement(&empty_info_supplement);
+	return AST_MODULE_LOAD_SUCCESS;
+}
+
+static int unload_module(void)
+{
+	ast_sip_session_unregister_supplement(&empty_info_supplement);
+	return 0;
+}
+
+AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Empty INFO Support",
+	.support_level = AST_MODULE_SUPPORT_CORE,
+	.load = load_module,
+	.unload = unload_module,
+	.load_pri = AST_MODPRI_APP_DEPEND,
+);