From beffab1d680104f2c469d0947a2a8b0e09d9c343 Mon Sep 17 00:00:00 2001
From: Dragos Oancea <dragos@signalwire.com>
Date: Sun, 20 Mar 2022 17:25:37 +0300
Subject: [PATCH] [core] RTP: a media timeout fix + add pcap based-unit tests.

---
 configure.ac                                 |  16 +
 src/switch_core_media.c                      |  12 +-
 src/switch_rtp.c                             |   2 +-
 tests/unit/Makefile.am                       |   6 +
 tests/unit/conf_rtp/freeswitch.xml           |  73 +++
 tests/unit/pcap/milliwatt.long.pcmu.rtp.pcap | Bin 0 -> 164014 bytes
 tests/unit/pcap/milliwatt.pcmu.rtp.pcap      | Bin 0 -> 53384 bytes
 tests/unit/switch_rtp_pcap.c                 | 580 +++++++++++++++++++
 8 files changed, 687 insertions(+), 2 deletions(-)
 create mode 100644 tests/unit/conf_rtp/freeswitch.xml
 create mode 100644 tests/unit/pcap/milliwatt.long.pcmu.rtp.pcap
 create mode 100644 tests/unit/pcap/milliwatt.pcmu.rtp.pcap
 create mode 100644 tests/unit/switch_rtp_pcap.c

diff --git a/configure.ac b/configure.ac
index 4131e629a6..3ee7c58f9d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1970,6 +1970,22 @@ else
 	AC_MSG_WARN([python3 support disabled, building mod_python3 will fail!])
 fi
 
+# pcap lib for unit-testing
+AC_MSG_CHECKING(libpcap)
+AC_CHECK_PROG(HAVE_PCAP_CONFIG,pcap-config,[true],[false])
+if test x"$HAVE_PCAP_CONFIG" = x"true"; then
+   AC_MSG_RESULT(yes)
+   PCAP_CONFIG=pcap-config
+   PCAP_LIBS="`$PCAP_CONFIG --libs`"
+   PCAP_CFLAGS="`$PCAP_CONFIG --cflags`"
+   AM_CONDITIONAL([HAVE_PCAP], [true])
+else
+   AC_MSG_RESULT(no)
+   AM_CONDITIONAL([HAVE_PCAP], [false])
+fi
+AC_SUBST([PCAP_CFLAGS])
+AC_SUBST([PCAP_LIBS])
+
 #
 # SNMP checks for mod_snmp
 #
diff --git a/src/switch_core_media.c b/src/switch_core_media.c
index e27b81e166..347735cf1b 100644
--- a/src/switch_core_media.c
+++ b/src/switch_core_media.c
@@ -2882,8 +2882,18 @@ static void check_media_timeout_params(switch_core_session_t *session, switch_rt
 
 	if (switch_rtp_ready(engine->rtp_session) && engine->media_timeout) {
 		switch_rtp_set_media_timeout(engine->rtp_session, engine->media_timeout);
-	}
+		if (engine->type == SWITCH_MEDIA_TYPE_AUDIO) {
+			/* the values are in milliseconds, not in seconds as the deprecated rtp_timeout_sec */
+			engine->max_missed_packets = (engine->read_impl.samples_per_second * engine->media_timeout / 1000) / engine->read_impl.samples_per_packet;
 
+			switch_rtp_set_max_missed_packets(engine->rtp_session, engine->max_missed_packets);
+			if (!engine->media_hold_timeout) {
+				engine->media_hold_timeout = engine->media_timeout * 10;
+			}
+
+			engine->max_missed_hold_packets = (engine->read_impl.samples_per_second * engine->media_hold_timeout / 1000) / engine->read_impl.samples_per_packet;
+		}
+	}
 }
 
 SWITCH_DECLARE(switch_status_t) switch_core_media_read_frame(switch_core_session_t *session, switch_frame_t **frame,
diff --git a/src/switch_rtp.c b/src/switch_rtp.c
index a7bd2f8d83..5f4ce0f738 100644
--- a/src/switch_rtp.c
+++ b/src/switch_rtp.c
@@ -7350,7 +7350,7 @@ static void check_timeout(switch_rtp_t *rtp_session)
 	}
 
 	switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(rtp_session->session), SWITCH_LOG_DEBUG10,
-					  "%s MEDIA TIMEOUT %s %d/%d", switch_core_session_get_name(rtp_session->session), rtp_type(rtp_session),
+					  "%s MEDIA TIMEOUT %s %d/%d\n", switch_core_session_get_name(rtp_session->session), rtp_type(rtp_session),
 					  elapsed, rtp_session->media_timeout);
 
 	if (elapsed > rtp_session->media_timeout) {
diff --git a/tests/unit/Makefile.am b/tests/unit/Makefile.am
index d24e30f62b..e2cec69089 100644
--- a/tests/unit/Makefile.am
+++ b/tests/unit/Makefile.am
@@ -5,6 +5,12 @@ noinst_PROGRAMS = switch_event switch_hash switch_ivr_originate switch_utils swi
 noinst_PROGRAMS += switch_core_video switch_core_db switch_vad switch_packetizer switch_core_session test_sofia switch_ivr_async switch_core_asr switch_log
 
 noinst_PROGRAMS+= switch_hold switch_sip
+
+if HAVE_PCAP
+noinst_PROGRAMS += switch_rtp_pcap
+AM_LDFLAGS += $(PCAP_LIBS)
+endif 
+
 AM_LDFLAGS += -avoid-version -no-undefined $(SWITCH_AM_LDFLAGS) $(openssl_LIBS)
 AM_LDFLAGS += $(FREESWITCH_LIBS) $(switch_builddir)/libfreeswitch.la $(CORE_LIBS) $(APR_LIBS)
 
diff --git a/tests/unit/conf_rtp/freeswitch.xml b/tests/unit/conf_rtp/freeswitch.xml
new file mode 100644
index 0000000000..69130f8f82
--- /dev/null
+++ b/tests/unit/conf_rtp/freeswitch.xml
@@ -0,0 +1,73 @@
+<?xml version="1.0"?>
+<document type="freeswitch/xml">
+  <X-PRE-PROCESS cmd="exec-set" data="test=echo 1234"/>
+  <X-PRE-PROCESS cmd="set" data="default_password=$${test}"/>
+  <X-PRE-PROCESS cmd="set" data="core_video_blank_image=$${conf_dir}/freeswitch-logo.png"/>
+  <section name="configuration" description="Various Configuration">
+    <configuration name="modules.conf" description="Modules">
+      <modules>
+        <load module="mod_console"/>
+        <load module="mod_loopback"/>
+        <load module="mod_commands"/>
+        <load module="mod_sndfile"/>
+        <load module="mod_dptools"/>
+        <load module="mod_tone_stream"/>
+		<load module="mod_test"/>
+      </modules>
+    </configuration>
+
+    <configuration name="console.conf" description="Console Logger">
+      <mappings>
+        <map name="all" value="console,debug,info,notice,warning,err,crit,alert"/>
+      </mappings>
+      <settings>
+        <param name="colorize" value="true"/>
+        <param name="loglevel" value="debug"/>
+    
+      </settings>
+    </configuration>
+
+ <configuration name="switch.conf" description="Core Configuration">
+ 
+   <default-ptimes>
+   </default-ptimes>
+ 
+   <settings>
+ 
+     <param name="colorize-console" value="false"/>
+     <param name="dialplan-timestamps" value="false"/>
+     <param name="loglevel" value="debug"/>
+     <param name="rtp-start-port" value="1234"/>
+     <param name="rtp-end-port" value="1234"/>
+     <param name="rtp-enable-zrtp" value="false"/>
+ 
+   </settings>
+ </configuration>
+ 
+    <configuration name="timezones.conf" description="Timezones">
+      <timezones>
+          <zone name="GMT" value="GMT0" />
+      </timezones>
+    </configuration>
+
+  </section>
+
+  <section name="dialplan" description="Regex/XML Dialplan">
+  <context name="test">
+    <extension>
+      <condition field="${sip_h_X-COUNTDOWN}" expression="^0$" break="on-true">
+        <action application="answer"/>
+        <action application="playback" data="tone_stream://%(251,0,1004);loops=-1"/>
+      </condition>
+      <condition field="${sip_h_X-COUNTDOWN}" expression="^(\d+)$" break="never">
+        <action application="export" data="_nolocal_sip_h_X-COUNTDOWN=${expr($1 - 1)}"/>
+        <anti-action application="export" data="_nolocal_sip_h_X-COUNTDOWN=10"/>
+      </condition>
+      <condition>
+        <action application="bridge" data="sofia/test/1234@127.0.0.1"/>
+      </condition>
+    </extension>
+  </context>
+
+	</section>
+</document>
diff --git a/tests/unit/pcap/milliwatt.long.pcmu.rtp.pcap b/tests/unit/pcap/milliwatt.long.pcmu.rtp.pcap
new file mode 100644
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diff --git a/tests/unit/pcap/milliwatt.pcmu.rtp.pcap b/tests/unit/pcap/milliwatt.pcmu.rtp.pcap
new file mode 100644
index 0000000000000000000000000000000000000000..8f68eaca98346a4eba5c4d4c77d71034ec9b4184
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diff --git a/tests/unit/switch_rtp_pcap.c b/tests/unit/switch_rtp_pcap.c
new file mode 100644
index 0000000000..74b79f9a24
--- /dev/null
+++ b/tests/unit/switch_rtp_pcap.c
@@ -0,0 +1,580 @@
+/*
+* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+* Copyright (C) 2005-2021, Anthony Minessale II <anthm@freeswitch.org>
+*
+* Version: MPL 1.1
+*
+* The contents of this file are subject to the Mozilla Public License Version
+* 1.1 (the "License"); you may not use this file except in compliance with
+* the License. You may obtain a copy of the License at
+* http://www.mozilla.org/MPL/
+*
+* Software distributed under the License is distributed on an "AS IS" basis,
+* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+* for the specific language governing rights and limitations under the
+* License.
+*
+* The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+*
+* The Initial Developer of the Original Code is
+* Anthony Minessale II <anthm@freeswitch.org>
+* Portions created by the Initial Developer are Copyright (C)
+* the Initial Developer. All Rights Reserved.
+*
+* Contributor(s):
+* Dragos Oancea <dragos@signalwire.com>
+*
+* switch_rtp_pcap.c -- tests RTP stack using PCAP.
+*/
+
+
+#include <switch.h>
+#include <test/switch_test.h>
+
+/* before adding a pcap file: tcprewrite --dstipmap=X.X.X.X/32:192.168.0.1/32 --srcipmap=X.X.X.X/32:192.168.0.2/32 -i in.pcap -o out.pcap */
+
+#include <pcap.h>
+
+#ifndef MSG_CONFIRM
+#define MSG_CONFIRM 0
+#endif
+
+static const char *rx_host = "127.0.0.1";
+static const char *tx_host = "127.0.0.1";
+static switch_rtp_t *rtp_session = NULL;
+const char *err = NULL;
+switch_rtp_packet_t rtp_packet;
+switch_frame_flag_t *frame_flags;
+switch_io_flag_t io_flags;
+switch_payload_t read_pt;
+static switch_port_t audio_rx_port = 1234;
+
+static int got_media_timeout = 0;
+
+//#define USE_RTCP_PCAP 
+
+#define NTP_TIME_OFFSET 2208988800UL
+
+/* https://www.tcpdump.org/pcap.html */
+/* IP header */
+struct sniff_ip {
+	u_char ip_vhl;		/* version << 4 | header length >> 2 */
+	u_char ip_tos;		/* type of service */
+	u_short ip_len;		/* total length */
+	u_short ip_id;		/* identification */
+	u_short ip_off;		/* fragment offset field */
+#define IP_RF 0x8000		/* reserved fragment flag */
+#define IP_DF 0x4000		/* dont fragment flag */
+#define IP_MF 0x2000		/* more fragments flag */
+#define IP_OFFMASK 0x1fff	/* mask for fragmenting bits */
+	u_char ip_ttl;		/* time to live */
+	u_char ip_p;		/* protocol */
+	u_short ip_sum;		/* checksum */
+	struct in_addr ip_src,ip_dst; /* source and dest address */
+};
+
+#define IP_HL(ip)		(((ip)->ip_vhl) & 0x0f)
+
+/* switch_rtp.c - calc_local_lsr_now()  */
+static inline uint32_t test_calc_local_lsr_now(switch_time_t now, uint32_t past /*milliseconds*/) 
+{
+//	switch_time_t now;
+	uint32_t ntp_sec, ntp_usec, lsr_now, sec;
+//	now = switch_micro_time_now() - (past * 1000);
+	now = now - (past * 1000);
+	sec = (uint32_t)(now/1000000);        /* convert to seconds     */
+	ntp_sec = sec+NTP_TIME_OFFSET;  /* convert to NTP seconds */
+	ntp_usec = (uint32_t)(now - ((switch_time_t) sec*1000000)); /* remove seconds to keep only the microseconds */
+	 
+	lsr_now = (uint32_t)(ntp_usec*0.065536) | (ntp_sec&0x0000ffff)<<16; /* 0.065536 is used for convertion from useconds to fraction of     65536 (x65536/1000000) */
+	return lsr_now;
+}
+
+#if 0
+static void test_prepare_rtcp(void *rtcp_packet, float est_last, uint32_t rtt, uint8_t loss) 
+{
+	/* taken from switch_rtp.c, rtcp_generate_sender_info() */
+	/* === */
+	char *rtcp_sr_trigger = rtcp_packet;
+	switch_time_t now;
+	uint32_t sec, ntp_sec, ntp_usec;
+	uint32_t ntp_msw;
+	uint32_t ntp_lsw;
+	uint32_t *ptr_msw;
+	uint32_t *ptr_lsw;
+	uint32_t lsr;
+	uint32_t *ptr_lsr;
+	uint32_t dlsr = 0;
+	uint32_t *ptr_dlsr;
+	uint8_t *ptr_loss;
+
+	now = switch_micro_time_now();
+	sec = (uint32_t)(now/1000000);        /* convert to seconds     */
+	ntp_sec = sec+NTP_TIME_OFFSET;  /* convert to NTP seconds */
+	ntp_msw = htonl(ntp_sec);   /* store result in "most significant word" */
+	ntp_usec = (uint32_t)(now - (sec*1000000)); /* remove seconds to keep only the microseconds */
+	ntp_lsw = htonl((u_long)(ntp_usec*(double)(((uint64_t)1)<<32)*1.0e-6)); 
+
+	/* === */
+
+	/*patch the RTCP payload to set the RTT we want */
+
+	ptr_msw = (uint32_t *)rtcp_sr_trigger + 2;
+	*ptr_msw = ntp_msw;
+	
+	ptr_lsw = (uint32_t *)rtcp_sr_trigger + 3;
+	*ptr_lsw = ntp_lsw;
+
+	lsr = test_calc_local_lsr_now(now, est_last * 1000 + rtt /*ms*/);
+
+	ptr_lsr = (uint32_t *)rtcp_sr_trigger + 11;
+	*ptr_lsr  = htonl(lsr);
+
+	ptr_dlsr = (uint32_t *)rtcp_sr_trigger + 12;
+	*ptr_dlsr  = htonl(dlsr);
+
+	ptr_loss = (uint8_t *)rtcp_sr_trigger + 32;
+	*ptr_loss  = loss;
+}
+#endif
+
+static switch_status_t rtp_test_start_call(switch_core_session_t **psession)
+{
+	char *r_sdp;
+	uint8_t match = 0, p = 0;
+	switch_core_session_t *session; 
+	switch_channel_t *channel = NULL;
+	switch_status_t status;
+	switch_media_handle_t *media_handle;
+	switch_core_media_params_t *mparams;
+	switch_stream_handle_t stream = { 0 };
+	switch_call_cause_t cause;
+
+	/*tone stream extension*/
+	status = switch_ivr_originate(NULL, psession, &cause, "null/+1234", 2, NULL, NULL, NULL, NULL, NULL, SOF_NONE, NULL, NULL);
+	session = *psession;
+
+	if (!(session)) {
+		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "no session\n");
+		return SWITCH_STATUS_FALSE;
+	}
+
+	if (status != SWITCH_STATUS_SUCCESS) {
+		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "switch_ivr_originate() failed\n");
+		return SWITCH_STATUS_FALSE;
+	}
+
+	channel = switch_core_session_get_channel(session);
+	if (!channel) {
+		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "switch_core_session_get_channel() failed\n");
+		return SWITCH_STATUS_FALSE;
+	}
+	mparams = switch_core_session_alloc(session, sizeof(switch_core_media_params_t));
+	mparams->inbound_codec_string = switch_core_session_strdup(session, "PCMU");
+	mparams->outbound_codec_string = switch_core_session_strdup(session, "PCMU");
+	mparams->rtpip = switch_core_session_strdup(session, (char *)rx_host);
+
+	status = switch_media_handle_create(&media_handle, session, mparams);
+	if (status != SWITCH_STATUS_SUCCESS) {
+		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "switch_media_handle_create() failed\n");
+		return SWITCH_STATUS_FALSE;
+	}
+
+	switch_channel_set_variable(channel, "absolute_codec_string", "PCMU");
+	switch_channel_set_variable(channel, "send_silence_when_idle", "-1");
+	switch_channel_set_variable(channel, "rtp_timer_name", "soft");
+	switch_channel_set_variable(channel, "media_timeout", "1000");
+
+	switch_channel_set_variable(channel, SWITCH_LOCAL_MEDIA_IP_VARIABLE, rx_host);
+	switch_channel_set_variable_printf(channel, SWITCH_LOCAL_MEDIA_PORT_VARIABLE, "%d", audio_rx_port);
+
+	r_sdp = switch_core_session_sprintf(session,
+	"v=0\n"
+	"o=FreeSWITCH 1632033305 1632033306 IN IP4 %s\n"
+	"s=-\n"
+	"c=IN IP4 %s\n"
+	"t=0 0\n"
+	"m=audio 11114 RTP/AVP 0 101\n"
+	"a=rtpmap:0 PCMU/8000\n"
+	"a=rtpmap:101 telephone-event/8000\n"
+	"a=rtcp-mux\n",
+	tx_host, tx_host);
+	 
+	status = switch_core_media_prepare_codecs(session, SWITCH_FALSE);
+	if (status != SWITCH_STATUS_SUCCESS) {
+		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "switch_core_media_prepare_codecs() failed\n");
+		return SWITCH_STATUS_FALSE;
+	}
+	   
+	match = switch_core_media_negotiate_sdp(session, r_sdp, &p, SDP_TYPE_REQUEST);
+	if (match != 1) {
+		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "switch_core_media_negotiate_sdp() failed\n");
+		return SWITCH_STATUS_FALSE;
+	}
+
+	status = switch_core_media_choose_ports(session, SWITCH_TRUE, SWITCH_FALSE);
+	if (status != SWITCH_STATUS_SUCCESS) {
+		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "switch_core_media_choose_ports() failed\n");
+		return SWITCH_STATUS_FALSE;
+	}
+
+	status = switch_core_media_activate_rtp(session);
+	if (status != SWITCH_STATUS_SUCCESS) {
+		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "switch_core_media_activate_rtp() failed\n");
+		return SWITCH_STATUS_FALSE;
+	}
+
+	switch_core_media_set_rtp_flag(session, SWITCH_MEDIA_TYPE_AUDIO, SWITCH_RTP_FLAG_DEBUG_RTP_READ);
+	switch_core_media_set_rtp_flag(session, SWITCH_MEDIA_TYPE_AUDIO, SWITCH_RTP_FLAG_DEBUG_RTP_WRITE);
+
+	SWITCH_STANDARD_STREAM(stream);
+	switch_api_execute("fsctl", "debug_level 10", session, &stream);
+	switch_safe_free(stream.data);
+
+	return SWITCH_STATUS_SUCCESS;
+}
+
+static switch_status_t rtp_test_end_call(switch_core_session_t **psession) 
+{
+	switch_channel_t *channel = NULL;
+	switch_core_session_t *session = *psession; 
+
+	channel = switch_core_session_get_channel(session);
+	if (!channel) {
+		return SWITCH_STATUS_FALSE;
+	}
+	switch_channel_hangup(channel, SWITCH_CAUSE_NORMAL_CLEARING);
+	switch_media_handle_destroy(session);
+	switch_core_session_rwunlock(session);
+	
+	return SWITCH_STATUS_SUCCESS;
+}
+
+static void rtp_test_init_frame(switch_frame_t **pwrite_frame, switch_core_session_t **psession)
+{
+	const unsigned char hdr_packet[]="\x80\x00\xcd\x15\xfd\x86\x00\x00\x61\x5a\xe1\x37";
+
+	switch_frame_alloc(pwrite_frame, SWITCH_RECOMMENDED_BUFFER_SIZE);
+	(*pwrite_frame)->codec = switch_core_session_get_write_codec(*psession);
+
+	(*pwrite_frame)->datalen = SWITCH_RTP_HEADER_LEN; /*init with dummy RTP header*/
+	memcpy((*pwrite_frame)->data, &hdr_packet, SWITCH_RTP_HEADER_LEN);
+}
+
+static void show_event(switch_event_t *event) {
+	char *str;
+	/*print the event*/
+	switch_event_serialize_json(event, &str);
+	if (str) {
+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "%s\n", str);
+		switch_safe_free(str);
+	}
+}
+
+static void event_handler(switch_event_t *event) 
+{
+	const char *new_ev = switch_event_get_header(event, "Event-Name");
+
+	if (new_ev && !strcmp(new_ev, "CHANNEL_HANGUP")) {
+		if (!strcmp(switch_event_get_header(event, "Hangup-Cause"), "MEDIA_TIMEOUT")) {
+			got_media_timeout = 1;
+		}
+	}
+
+	show_event(event);
+}
+
+FST_CORE_DB_BEGIN("./conf_rtp")
+{
+FST_SUITE_BEGIN(switch_rtp_pcap)
+{
+
+FST_SETUP_BEGIN()
+{
+	fst_requires_module("mod_loopback");
+}
+FST_SETUP_END()
+
+FST_TEARDOWN_BEGIN()
+{
+}
+FST_TEARDOWN_END()
+#if 0
+	FST_TEST_BEGIN(test_rtp_stall_with_rtcp_muxed_with_timer)
+	{
+		switch_core_session_t *session = NULL;
+		switch_status_t status;
+		uint32_t plen = SWITCH_RTP_HEADER_LEN;
+		char rpacket[SWITCH_RECOMMENDED_BUFFER_SIZE];
+		switch_payload_t pt = { 0 };
+		switch_frame_flag_t frameflags = { 0 };
+		int x = 0;
+		switch_frame_t *write_frame;
+		pcap_t *pcap;
+		const unsigned char *packet;
+		char errbuf[PCAP_ERRBUF_SIZE];
+		struct pcap_pkthdr pcap_header;
+		char rtcp_sr_trigger[] = "\x81\xc8\x00\x0c\x78\x9d\xac\x45\xe2\x67\xa5\x74\x30\x60\x56\x81\x00\x19"
+			"\xaa\x00\x00\x00\x06\xd7\x00\x01\x2c\x03\x5e\xbd\x2f\x0b\x00"
+			"\x00\x00\x00\x00\x00\x57\xc4\x00\x00\x00\x39\xa5\x73\xfe\x90\x00\x00\x2c\x87"
+			"\x81\xca\x00\x0c\x78\x9d\xac\x45\x01\x18\x73\x69\x70\x3a\x64\x72\x40\x31\x39\x32\x2e"
+			"\x31\x36\x38\x2e\x30\x2e\x31\x33\x3a\x37\x30\x36\x30\x06\x0e\x4c\x69\x6e\x70\x68\x6f"
+			"\x6e\x65\x2d\x33\x2e\x36\x2e\x31\x00\x00";
+		const struct sniff_ip *ip; /* The IP header */
+		int size_ip, jump_over;
+		struct timeval prev_ts = { 0 };
+		switch_time_t time_nowpacket = 0, time_prevpacket = 0;
+		switch_socket_t *sock_rtp = NULL;
+		switch_sockaddr_t *sock_addr = NULL;
+		const char *str_err;
+		switch_size_t rough_add = 0;
+
+		status = rtp_test_start_call(&session);
+		fst_requires(status == SWITCH_STATUS_SUCCESS);
+		fst_requires(session);
+
+		pcap = pcap_open_offline_with_tstamp_precision("pcap/milliwatt.long.pcmu.rtp.pcap", PCAP_TSTAMP_PRECISION_MICRO, errbuf);
+		fst_requires(pcap);
+
+		switch_core_media_set_rtp_flag(session, SWITCH_MEDIA_TYPE_AUDIO, SWITCH_RTP_FLAG_ENABLE_RTCP);
+
+		rtp_session = switch_core_media_get_rtp_session(session, SWITCH_MEDIA_TYPE_AUDIO);
+
+		rtp_test_init_frame(&write_frame, &session);
+
+		switch_rtp_clear_flag(rtp_session, SWITCH_RTP_FLAG_PAUSE);
+
+		if (switch_socket_create(&sock_rtp, AF_INET, SOCK_DGRAM, 0, switch_core_session_get_pool(session)) != SWITCH_STATUS_SUCCESS) {
+			fst_requires(0); /*exit*/ 
+		}
+
+		switch_sockaddr_new(&sock_addr, rx_host, audio_rx_port, switch_core_session_get_pool(session));
+		fst_requires(sock_addr);
+
+		switch_rtp_set_remote_address(rtp_session, tx_host, switch_sockaddr_get_port(sock_addr), 0, SWITCH_FALSE, &str_err);
+		switch_rtp_reset(rtp_session);
+
+		while ((packet = pcap_next(pcap, &pcap_header))) {
+			/*assume only UDP/RTP packets in the pcap*/
+			uint32_t rcvd_datalen = pcap_header.caplen;
+			size_t len;
+			switch_size_t tmp_len;
+
+			int diff_us = (pcap_header.ts.tv_sec-prev_ts.tv_sec)*1000000+(pcap_header.ts.tv_usec-prev_ts.tv_usec);
+
+			if (diff_us > 0) {
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "SENT pkt diff: %d us\n", diff_us);
+				usleep(diff_us);
+			}
+
+			prev_ts = pcap_header.ts;
+
+			len = pcap_header.caplen;
+
+			if (len <= 42) {
+				continue;
+			} 
+
+			ip = (struct sniff_ip*)(packet + 14);
+			size_ip = IP_HL(ip) * 4;
+
+			jump_over = 14 /*SIZE_ETHERNET*/ + size_ip /*IP HDR size*/ + 8 /* UDP HDR SIZE */; /* jump 42 bytes over network layers/headers */
+			packet += jump_over;
+			x++;
+			
+			if (!(x%10)) { /* send a RTCP SR packet every 10th RTP packet */
+				int add_rtt = 200;
+				test_prepare_rtcp(&rtcp_sr_trigger, 2, add_rtt, 0xa0);
+				tmp_len = sizeof(rtcp_sr_trigger);
+				/*RTCP muxed*/
+				if (switch_socket_sendto(sock_rtp, sock_addr, MSG_CONFIRM, (const char*)rtcp_sr_trigger, &tmp_len) != SWITCH_STATUS_SUCCESS) {
+					fst_requires(0);
+				}
+
+				plen = sizeof(rtcp_sr_trigger);
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_INFO, "Sent RTCP. Packet size = [%u]\n", plen);
+				status = switch_rtp_read(rtp_session, (void *)rpacket, &rcvd_datalen, &pt, &frameflags, io_flags);
+				if (pt == SWITCH_RTP_CNG_PAYLOAD /*timeout*/) { 
+					switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "read CNG/RTCP, skip\n");
+					while (1) {
+						status = switch_rtp_read(rtp_session, (void *)&rpacket, &rcvd_datalen, &pt, &frameflags, io_flags);
+						if (frameflags || SFF_RTCP) break;
+					}
+				}
+				fst_requires(status == SWITCH_STATUS_SUCCESS);
+			}
+
+			if (packet[0] == 0x80 && packet[1] == 0 /*PCMU*/) {
+				int16_t *seq = (int16_t *)packet + 1;
+				plen = len - jump_over;
+				tmp_len = plen;
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Sent RTP. Packet size = [%u] seq = [%d]\n", plen, htons(*seq));
+				if (switch_socket_sendto(sock_rtp, sock_addr, MSG_CONFIRM, (const char*)packet, &tmp_len) != SWITCH_STATUS_SUCCESS) {
+					fst_requires(0);
+				}
+			}
+
+			status = switch_rtp_read(rtp_session, (void *)&rpacket, &rcvd_datalen, &pt, &frameflags, io_flags);
+			if (pt == SWITCH_RTP_CNG_PAYLOAD /*timeout*/) {
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "read CNG, skip\n");
+				continue;
+			}
+			time_prevpacket = time_nowpacket;
+			time_nowpacket = switch_time_now();
+			if (time_prevpacket) { // skip init.
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "RECV pkt diff: %ld us\n", time_nowpacket - time_prevpacket);
+
+				fst_requires((time_nowpacket - time_prevpacket) < 80000);
+				rough_add += time_nowpacket - time_prevpacket; /* just add to var for visual comparison */
+			}
+			fst_requires(status == SWITCH_STATUS_SUCCESS);
+			if (pt == SWITCH_RTP_CNG_PAYLOAD /*timeout*/) continue;
+			fst_requires(rcvd_datalen == plen - SWITCH_RTP_HEADER_LEN);
+		}
+
+		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "RECV total delay: %lu\n", rough_add); /*around 17092408 us*/
+		switch_yield(1000 * 1000);
+
+		if (write_frame) switch_frame_free(&write_frame);
+
+		switch_rtp_destroy(&rtp_session);
+
+		rtp_test_end_call(&session);
+
+		switch_socket_close(sock_rtp);
+
+		pcap_close(pcap);
+
+		switch_yield(1000 * 1000);
+	}
+	FST_TEST_END()
+#endif
+
+	FST_TEST_BEGIN(test_rtp_media_timeout)
+	{
+		switch_core_session_t *session = NULL;
+		switch_status_t status;
+		uint32_t plen = SWITCH_RTP_HEADER_LEN;
+		char rpacket[SWITCH_RECOMMENDED_BUFFER_SIZE];
+		switch_payload_t pt = { 0 };
+		switch_frame_flag_t frameflags = { 0 };
+		int x = 0;
+		switch_frame_t *write_frame;
+		pcap_t *pcap;
+		const unsigned char *packet;
+		char errbuf[PCAP_ERRBUF_SIZE];
+		struct pcap_pkthdr pcap_header;
+		const struct sniff_ip *ip; /* The IP header */
+		int size_ip, jump_over;
+		struct timeval prev_ts = { 0 };
+		switch_socket_t *sock_rtp = NULL;
+		switch_sockaddr_t *sock_addr = NULL;
+		const char *str_err;
+
+		status = rtp_test_start_call(&session);
+		fst_requires(status == SWITCH_STATUS_SUCCESS);
+		fst_requires(session);
+
+		switch_event_bind("", SWITCH_EVENT_ALL, SWITCH_EVENT_SUBCLASS_ANY, event_handler, NULL);
+
+		pcap = pcap_open_offline_with_tstamp_precision("pcap/milliwatt.pcmu.rtp.pcap", PCAP_TSTAMP_PRECISION_MICRO, errbuf);
+		fst_requires(pcap);
+
+		switch_core_media_set_rtp_flag(session, SWITCH_MEDIA_TYPE_AUDIO, SWITCH_RTP_FLAG_ENABLE_RTCP);
+
+		rtp_session = switch_core_media_get_rtp_session(session, SWITCH_MEDIA_TYPE_AUDIO);
+		fst_requires(rtp_session);
+
+		rtp_test_init_frame(&write_frame, &session);
+
+		switch_rtp_clear_flag(rtp_session, SWITCH_RTP_FLAG_PAUSE);
+
+		if (switch_socket_create(&sock_rtp, AF_INET, SOCK_DGRAM, 0, switch_core_session_get_pool(session)) != SWITCH_STATUS_SUCCESS) {
+			fst_requires(0); /*exit*/ 
+		}
+
+		switch_sockaddr_new(&sock_addr, rx_host, audio_rx_port, switch_core_session_get_pool(session));
+		fst_requires(sock_addr);
+
+		switch_rtp_set_remote_address(rtp_session, tx_host, switch_sockaddr_get_port(sock_addr), 0, SWITCH_FALSE, &str_err);
+		switch_rtp_reset(rtp_session);
+
+		/* send 3 packets then wait and expect RTP timeout */
+		while ((packet = pcap_next(pcap, &pcap_header)) && x < 3) {
+			/*assume only UDP/RTP packets in the pcap*/
+			uint32_t rcvd_datalen = pcap_header.caplen;
+			size_t len;
+			switch_size_t tmp_len;
+
+			int diff_us = (pcap_header.ts.tv_sec-prev_ts.tv_sec)*1000000+(pcap_header.ts.tv_usec-prev_ts.tv_usec);
+			if (diff_us > 0) {
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "SENT pkt diff: %d us\n", diff_us);
+				usleep(diff_us);
+			}
+
+			x++;
+
+			prev_ts = pcap_header.ts;
+
+			len = pcap_header.caplen;
+
+			if (len <= 42) {
+				continue;
+			} 
+
+			ip = (struct sniff_ip*)(packet + 14);
+			size_ip = IP_HL(ip) * 4;
+
+			jump_over = 14 /*SIZE_ETHERNET*/ + size_ip /*IP HDR size*/ + 8 /* UDP HDR SIZE */; /* jump 42 bytes over network layers/headers */
+			packet += jump_over;
+			
+			if (packet[0] == 0x80 && packet[1] == 0 /*PCMU*/) {
+				int16_t *seq = (int16_t *)packet + 1;
+				plen = len - jump_over;
+				tmp_len = plen;
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Sent RTP. Packet size = [%u] seq = [%d]\n", plen, htons(*seq));
+				if (switch_socket_sendto(sock_rtp, sock_addr, MSG_CONFIRM, (const char*)packet, &tmp_len) != SWITCH_STATUS_SUCCESS) {
+					fst_requires(0);
+				}
+			}
+
+			status = switch_rtp_read(rtp_session, (void *)&rpacket, &rcvd_datalen, &pt, &frameflags, io_flags);
+			if (pt == SWITCH_RTP_CNG_PAYLOAD /*timeout*/) {
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "read CNG, skip\n");
+				continue;
+			}
+
+			fst_requires(status == SWITCH_STATUS_SUCCESS);
+			fst_requires(rcvd_datalen == plen - SWITCH_RTP_HEADER_LEN);
+		}
+
+		x = 150; /* 3 seconds max */
+		while (x || !got_media_timeout) {
+			uint32_t rcvd_datalen; 
+			status = switch_rtp_read(rtp_session, (void *)&rpacket, &rcvd_datalen, &pt, &frameflags, io_flags);
+			if (pt == SWITCH_RTP_CNG_PAYLOAD /*timeout*/) {
+				switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "read CNG, skip\n");
+			}
+			switch_yield(20 * 1000);
+			fst_requires(status == SWITCH_STATUS_SUCCESS);
+			x--;
+		}
+
+		if (write_frame) switch_frame_free(&write_frame);
+
+		switch_rtp_destroy(&rtp_session);
+
+		rtp_test_end_call(&session);
+
+		switch_socket_close(sock_rtp);
+
+		pcap_close(pcap);
+
+		fst_check(got_media_timeout);
+	}
+	FST_TEST_END()
+}
+FST_SUITE_END()
+}
+FST_CORE_END()
+