net/sems: SIP Express Media Server (new port)

SEMS is an open-source SIP media server, implementing a B2BUA, voicemail, IVRs, announcements, etc. It is designed to be complementary to SIP proxy-only tools like Kamailio, OpenSIPS, etc. This adds a new port for the SEMS SIP media server, which provides a number of functions (Voicemail, conferencing, B2BUA, etc.) in conjunction with a SIP router like Kamailio or OpenSIPS. The most recent release (1.6.0) is both old and has a significant number of issues on FreeBSD, so this corresponds to the current development branch, which should hopefully become 1.7 in not too very long. I've added one other patch (from SEMS pull request 57) that is required to make message-waiting notifications behave in a useful way but has yet to be merged upstream. WWW: https://github.com/sems-server/sems/ PR: 240048 Reviewed by: koobs (ports) Approved by: koobs (ports) Differential Revision: D21410
svn path=/head/; revision=509981
2019-08-27 03:15:35 +00:00 · 2019-08-27 03:15:35 +00:00 · d0170de30a · 2021-03-31 03:12:20 +00:00
commit d0170de30a
parent eb0b62e96e
10 changed files with 696 additions and 2 deletions
--- a/2
+++ b/2
@ -190,7 +190,7 @@ mastodon:*:244:
 fcron:*:247:
 # free: 248
 # free: 249
-# free: 250
+sems:*:250:
 # free: 251
 # free: 252
 _adsuck:*:253:
--- a/2
+++ b/2
@ -195,7 +195,7 @@ mastodon:*:244:244::0:0:Mastodon User:/usr/local/www/mastodon:/bin/sh
 fcron:*:247:247::0:0:fcron pseudo-user:/nonexistent:/usr/sbin/nologin
 # free: 248
 # free: 249
-# free: 250
+sems:*:250:250::0:0:SIP Express Media Server:/nonexistent:/usr/sbin/nologin
 # free: 251
 # free: 252
 _adsuck:*:253:253::0:0:Adsuck ad blocking user:/nonexistent:/usr/sbin/nologin
--- a/net/Makefile
+++ b/net/Makefile
@ -1358,6 +1358,7 @@
    SUBDIR += sdl_net
    SUBDIR += seda
    SUBDIR += self-service-password
+    SUBDIR += sems
    SUBDIR += sendemail
    SUBDIR += sendsms
    SUBDIR += sendsnpp
--- a/net/sems/Makefile
+++ b/net/sems/Makefile
@ -0,0 +1,48 @@
+# Created by: Nathan Whitehon <nwhitehorn@freebsd.org>
+# $FreeBSD$
+
+PORTNAME=	sems
+DISTVERSION=	${SEMS_VERSION}.g20190822
+CATEGORIES=	net
+
+MAINTAINER=	nwhitehorn@FreeBSD.org
+COMMENT=	SIP Express Media Server
+
+LICENSE=	GPLv2
+LICENSE_FILE=	${WRKSRC}/doc/COPYING
+
+LIB_DEPENDS=	libopus.so:audio/opus \
+		libcodec2.so:audio/codec2 \
+		libevent.so:devel/libevent \
+		librtmp.so:multimedia/librtmp \
+		libilbc.so:net/ilbc \
+		libgsm.so:audio/gsm \
+		libsamplerate.so:audio/libsamplerate \
+		libspeex.so:audio/speex \
+		libspandsp.so:comms/spandsp
+
+USES=		cmake python:2.7,run shebangfix
+SHEBANG_GLOB=	sems-*
+
+USE_GITHUB=	yes
+GH_ACCOUNT=	sems-server
+GH_TAGNAME=	7400051
+
+CFLAGS+=	-Wno-reorder
+CMAKE_ARGS=	-DSEMS_CFG_PREFIX=${PREFIX} -DSEMS_AUDIO_PREFIX=${PREFIX}/lib \
+		-DSEMS_EXEC_PREFIX=${PREFIX} -DSEMS_DOC_PREFIX=${PREFIX}/share/doc
+CMAKE_ON=	SEMS_USE_SPANDSP SEMS_USE_LIBSAMPLERATE SEMS_USE_OPUS
+
+USE_RC_SUBR=	sems
+
+USERS=		sems
+GROUPS=		sems
+
+SEMS_VERSION=	1.7.0
+PLIST_SUB=	SEMS_VERSION=${SEMS_VERSION}
+
+post-install:
+	cd ${STAGEDIR}${ETCDIR} && ${FIND} . \
+	    -type f -exec ${MV} {} {}.sample \;
+
+.include <bsd.port.mk>
--- a/net/sems/distinfo
+++ b/net/sems/distinfo
@ -0,0 +1,3 @@
+TIMESTAMP = 1566533104
+SHA256 (sems-server-sems-1.7.0.g20190822-7400051_GH0.tar.gz) = 0648e863c79363985e59174728f29a7b6c431fc76343fb004ed7c548aef7fcf0
+SIZE (sems-server-sems-1.7.0.g20190822-7400051_GH0.tar.gz) = 5200119
--- a/net/sems/files/patch-core-CMakeLists.txt
+++ b/net/sems/files/patch-core-CMakeLists.txt
@ -0,0 +1,21 @@
+--- core/CMakeLists.txt.orig	2019-08-22 14:04:22.265669000 -0700
+++ core/CMakeLists.txt	2019-08-22 14:05:02.760870000 -0700
+@@ -12,15 +12,12 @@
+ INCLUDE_DIRECTORIES (ampi)
+ INCLUDE_DIRECTORIES (amci)
+ 
+-ADD_LIBRARY (sems_core STATIC ${sems_core_SRCS})
+-ADD_LIBRARY (sems_sip STATIC ${sems_sip_SRCS})
+ADD_EXECUTABLE (sems sems.cpp ${sems_core_SRCS} ${sems_sip_SRCS})
+ADD_EXECUTABLE(sems_tests ${sems_tests_SRCS} ${sems_core_SRCS} ${sems_sip_SRCS})
+ 
+-ADD_EXECUTABLE (sems sems.cpp)
+-ADD_EXECUTABLE(sems_tests ${sems_tests_SRCS})
+-
+ FOREACH (EXE_TARGET sems sems_tests)
+ 
+-	TARGET_LINK_LIBRARIES(${EXE_TARGET} ${CMAKE_DL_LIBS} sems_core sems_sip event event_pthreads -rdynamic)
+	TARGET_LINK_LIBRARIES(${EXE_TARGET} ${CMAKE_DL_LIBS} event event_pthreads -rdynamic)
+ 
+ 	IF(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+ 		TARGET_LINK_LIBRARIES(${EXE_TARGET} execinfo)
--- a/net/sems/files/patch-mwi-57
+++ b/net/sems/files/patch-mwi-57
@ -0,0 +1,265 @@
+diff --git a/apps/mwi/etc/mwi.conf b/apps/mwi/etc/mwi.conf
+index 13fcce62c..ef7e5182b 100644
+--- apps/mwi/etc/mwi.conf
+++ apps/mwi/etc/mwi.conf
+@@ -1,2 +1,13 @@
+-# Presence Server:
+-presence_server=127.0.0.1
+\ No newline at end of file
+# use domain instead of presence_server
+use_domain=yes
+
+# Presence Server, not used if use_domain is true
+#presence_server=127.0.0.1
+
+# the from user for publish requests, not used if empty
+from_user=mwi-publisher
+# the to user for publish requests, not used if empty
+#to_user=
+
+# give a preset route set, not used if empty
+#route_set="sip:127.0.0.1"
+diff --git a/apps/mwi/mwi.cpp b/apps/mwi/mwi.cpp
+index 4e7035011..47b808be0 100644
+--- apps/mwi/mwi.cpp
+++ apps/mwi/mwi.cpp
+@@ -1,12 +1,13 @@
+ /*
+   Copyright (C) Anton Zagorskiy amberovsky@gmail.com
+   Oyster-Telecom Laboratory
+-        
+
+   Published under BSD License
+ */
+-            
+
+ #include "AmPlugIn.h"
+ #include "AmSession.h"
+#include "AmConfig.h"
+ #include "AmConfigReader.h"
+ #include "AmUtils.h"
+ #include "log.h"
+@@ -18,9 +19,9 @@ AmDynInvoke* MWI::MessageStorage = 0;
+ 
+ EXPORT_PLUGIN_CLASS_FACTORY(MWI, MOD_NAME);
+ 
+-MWI::MWI(const string& name)
+-  : AmDynInvokeFactory(name) { 
+-  _instance = this; 
+MWI::MWI(const string& name) : AmDynInvokeFactory(name)
+{
+  _instance = this;
+ };
+ 
+ MWI::~MWI() { };
+@@ -28,10 +29,10 @@ MWI::~MWI() { };
+ 
+ int MWI::onLoad()
+ {
+-  AmDynInvokeFactory* ms_fact = 
+  AmDynInvokeFactory* ms_fact =
+     AmPlugIn::instance()->getFactory4Di("msg_storage");
+ 
+-  if(!ms_fact || !(MessageStorage = ms_fact->getInstance())) {
+  if (!ms_fact || !(MessageStorage = ms_fact->getInstance())) {
+     ERROR("could not load msg_storage. Load a msg_storage implementation module.\n");
+     return -1;
+   };
+@@ -41,21 +42,38 @@ int MWI::onLoad()
+   es_args.push(this);
+   es_args.push("publish");
+   MessageStorage->invoke("events_subscribe",es_args,ret);
+-  
+
+   AmConfigReader cfg;
+-  if(cfg.loadFile(AmConfig::ModConfigPath + "mwi.conf")) {
+-    ERROR("can not load configuration file\n");
+-    return -1;
+
+  use_domain = true;
+  from_user = "mwi-publisher";
+  to_user = "";
+  route_set = "";
+  presence_server = "";
+
+  if(cfg.loadFile(AmConfig::ModConfigPath + string(MOD_NAME ".conf"))) {
+    INFO(MOD_NAME "configuration file (%s) not found, "
+      "assuming default configuration is fine\n",
+      (AmConfig::ModConfigPath + string(MOD_NAME ".conf")).c_str());
+
+    return 0;
+   };
+-  
+-  presence_server = cfg.getParameter("presence_server");
+-  if (presence_server.length())
+-    DBG("set presence server '%s'\n", presence_server.c_str());
+-  else {
+-    ERROR("parameter 'presence_server' did not found in the configuration file\n");
+-    return -1;
+-  }                
+-  
+
+  use_domain = cfg.getParameter("use_domain", "yes") == "yes";
+  from_user  = cfg.getParameter("from_user", from_user);
+  to_user  = cfg.getParameter("to_user", to_user);
+  route_set  = cfg.getParameter("route_set", route_set);
+
+  if (!use_domain) {
+      presence_server = cfg.getParameter("presence_server", presence_server);
+      if (presence_server.length() == 0) {
+        ERROR("use domain set to false, but parameter 'presence_server' not found in the configuration file\n");
+        return -1;
+      }
+
+      DBG("set presence server '%s'\n", presence_server.c_str());
+  }
+
+   DBG("MWI module loaded.\n");
+   return 0;
+ };
+@@ -66,54 +84,80 @@ void MWI::publish(const string& user, const string& domain)
+   int new_msgs = 0;
+   int all_msgs = 0;
+   string headers, body;
+-                                            
+
+   AmArg di_args, ret;
+   di_args.push(domain.c_str());
+   di_args.push(user.c_str());
+-    
+
+   MessageStorage->invoke("userdir_open",di_args,ret);
+-    
+
+   if (!ret.size() || !isArgInt(ret.get(0))) {
+     ERROR("userdir_open for user '%s' domain '%s' returned no (valid) result.\n", user.c_str(), domain.c_str());
+     return;
+   };
+-    
+
+   all_msgs = ret.get(1).size();
+   for (size_t i = 0; i < ret.get(1).size(); i++) {
+     AmArg& elem = ret.get(1).get(i);
+-    
+-    if (elem.get(2).asInt()) // skip empty messages
+
+    if (elem.get(2).asInt()) { // skip empty messages
+       new_msgs += elem.get(1).asInt();
+-    else
+    }
+    else {
+       all_msgs--;
+    }
+   };
+-                                                  
+
+   DBG("Found %d new and %d old messages\n", new_msgs, all_msgs - new_msgs);
+   string vm_buf = int2str(new_msgs) + "/" + int2str(all_msgs - new_msgs);
+ 
+   headers = "Event: message-summary\r\n";
+   headers += "Subscription-State: active\r\n";
+-    
+-  if (new_msgs > 0)
+
+  if (new_msgs > 0) {
+     body = "Messages-Waiting: yes\r\n";
+-  else
+  }
+  else {
+     body = "Messages-Waiting: no\r\n";
+  }
+ 
+   body += "Message-Account: sip:" + user + "@" + domain + "\r\n";
+   body += "Voice-Message: " + vm_buf + " (" + vm_buf + ")\r\n";
+ 
+   AmMimeBody sms_body;
+   sms_body.addPart("application/simple-message-summary");
+-  sms_body.setPayload((const unsigned char*)body.c_str(),body.length());
+  sms_body.setPayload((const unsigned char*) body.c_str(), body.length());
+
+  string from_uri = "sip:";
+  string to_uri   = "sip:";
+
+  if (from_user.length() != 0) {
+    from_uri += from_user + "@";
+  }
+
+  if (to_user.length() != 0) {
+      to_uri += to_user + "@";
+  }
+
+  if (use_domain) {
+      from_uri += domain;
+      to_uri   += domain;
+  }
+  else {
+      from_uri += presence_server;
+      to_uri   += presence_server;
+  }
+ 
+   AmSipDialog tmp_d(NULL);
+-  tmp_d.setLocalParty(string("<sip:mwi-publisher@") + presence_server + ">");
+-  tmp_d.setRemoteParty(domain.c_str());
+-  tmp_d.setRouteSet("sip:" + presence_server);
+   tmp_d.setRemoteUri("sip:" + user + "@" + domain);
+-  tmp_d.setCallid(AmSession::getNewId() + "@" + presence_server);
+  tmp_d.setLocalParty("<" + from_uri + ">");
+  tmp_d.setRemoteParty("<" + to_uri + ">");
+  if (route_set.length() != 0) {
+      tmp_d.setRouteSet(route_set);
+  }
+  tmp_d.setCallid(AmSession::getNewId() + "@" + AmConfig::SIP_Ifs[tmp_d.getOutboundIf()].getIP());
+   tmp_d.setLocalTag(AmSession::getNewId());
+-  tmp_d.sendRequest(SIP_METH_NOTIFY, &sms_body, headers);     
+  tmp_d.sendRequest(SIP_METH_PUBLISH, &sms_body, headers);
+ };
+ 
+ void MWI::invoke(const string& method, const AmArg& args, AmArg& ret)
+@@ -125,6 +169,7 @@ void MWI::invoke(const string& method, const AmArg& args, AmArg& ret)
+     publish(user, domain);
+     ret.push(0);
+   }
+-  else
+-    throw AmDynInvoke::NotImplemented(method); 
+  else {
+    throw AmDynInvoke::NotImplemented(method);
+  }
+ };
+diff --git a/apps/mwi/mwi.h b/apps/mwi/mwi.h
+index c1d7f1d65..0ec8ca46e 100644
+--- apps/mwi/mwi.h
+++ apps/mwi/mwi.h
+@@ -1,7 +1,7 @@
+ /*
+     Copyright (C) Anton Zagorskiy amberovsky@gmail.com
+     Oyster-Telecom Laboratory
+-    
+
+     Published under BSD License
+ */
+ 
+@@ -16,15 +16,21 @@ class MWI : public AmDynInvokeFactory, public AmDynInvoke
+ private:
+     static MWI* _instance;
+     static AmDynInvoke* MessageStorage;
+-    
+
+    bool use_domain;
+
+    string from_user;
+    string to_user;
+
+    string route_set;
+     string presence_server;
+-    
+
+     typedef struct
+     {
+ 	unsigned int new_msgs;
+ 	unsigned int saved_msgs;
+     } msg_info_struct;
+-    
+
+     void getMsgInfo (const string& name, const string& domain, msg_info_struct& msg_info);
+     void publish (const string& name, const string& domain);
+ 
--- a/net/sems/files/sems.in
+++ b/net/sems/files/sems.in
@ -0,0 +1,35 @@
+#!/bin/sh
+#
+# $FreeBSD$
+#
+# PROVIDE: sems 
+# REQUIRE: LOGIN
+# KEYWORD: shutdown
+#
+# Add the following line to /etc/rc.conf to enable this service
+# at system startup:
+#
+# sems_enable (bool): Set to NO by default.
+# 		      Set it to YES to enable sems.
+#
+
+. /etc/rc.subr
+
+name=sems
+rcvar=sems_enable
+
+load_rc_config ${name}
+
+: ${sems_enable:=NO}
+: ${sems_config:=%%PREFIX%%/etc/sems/sems.conf}
+
+command="%%PREFIX%%/sbin/sems"
+pidfile=/var/run/sems/sems.pid
+start_precmd="sems_precmd"
+sems_precmd()
+{
+	install -d -o sems /var/run/sems
+}
+command_args="-P $pidfile -f $sems_config -u sems -g sems"
+
+run_rc_command $1
--- a/net/sems/pkg-descr
+++ b/net/sems/pkg-descr
@ -0,0 +1,5 @@
+SEMS is an open-source SIP media server, implementing a B2BUA,
+voicemail, IVRs, announcements, etc. It is designed to be
+complementary to SIP proxy-only tools like Kamailio, OpenSIPS, etc.
+
+WWW: https://github.com/sems-server
--- a/net/sems/pkg-plist
+++ b/net/sems/pkg-plist
@ -0,0 +1,316 @@
+@sample %%ETCDIR%%/default.template.sample
+@sample %%ETCDIR%%/etc/ann_b2b.conf.sample
+@sample %%ETCDIR%%/etc/announce_transfer.conf.sample
+@sample %%ETCDIR%%/etc/announcement.conf.sample
+@sample %%ETCDIR%%/etc/annrecorder.conf.sample
+@sample %%ETCDIR%%/etc/app_mapping.conf.sample
+@sample %%ETCDIR%%/etc/auth_b2b.sbcprofile.conf.sample
+@sample %%ETCDIR%%/etc/call_timer.sbcprofile.conf.sample
+@sample %%ETCDIR%%/etc/callback.conf.sample
+@sample %%ETCDIR%%/etc/cc_call_timer.conf.sample
+@sample %%ETCDIR%%/etc/cc_pcalls.conf.sample
+@sample %%ETCDIR%%/etc/cc_syslog_cdr.conf.sample
+@sample %%ETCDIR%%/etc/click2dial.conf.sample
+@sample %%ETCDIR%%/etc/codecfilter.sbcprofile.conf.sample
+@sample %%ETCDIR%%/etc/conference.conf.sample
+@sample %%ETCDIR%%/etc/dsm.conf.sample
+@sample %%ETCDIR%%/etc/dsm_in_prompts.conf.sample
+@sample %%ETCDIR%%/etc/dsm_out_prompts.conf.sample
+@sample %%ETCDIR%%/etc/early_announce.conf.sample
+@sample %%ETCDIR%%/etc/echo.conf.sample
+@sample %%ETCDIR%%/etc/mod_regex.conf.sample
+@sample %%ETCDIR%%/etc/monitoring.conf.sample
+@sample %%ETCDIR%%/etc/msg_storage.conf.sample
+@sample %%ETCDIR%%/etc/mwi.conf.sample
+@sample %%ETCDIR%%/etc/precoded_announce.conf.sample
+@sample %%ETCDIR%%/etc/prepaid.sbcprofile.conf.sample
+@sample %%ETCDIR%%/etc/refuse.sbcprofile.conf.sample
+@sample %%ETCDIR%%/etc/reg_agent.conf.sample
+@sample %%ETCDIR%%/etc/replytranslate.sbcprofile.conf.sample
+@sample %%ETCDIR%%/etc/rtmp.conf.sample
+@sample %%ETCDIR%%/etc/sbc.conf.sample
+@sample %%ETCDIR%%/etc/src_ipmap.conf.sample
+@sample %%ETCDIR%%/etc/sst_b2b.sbcprofile.conf.sample
+@sample %%ETCDIR%%/etc/stats.conf.sample
+@sample %%ETCDIR%%/etc/symmetricrtp.sbcprofile.conf.sample
+@sample %%ETCDIR%%/etc/transparent.sbcprofile.conf.sample
+@sample %%ETCDIR%%/etc/voicebox.conf.sample
+@sample %%ETCDIR%%/etc/voicemail.conf.sample
+@sample %%ETCDIR%%/etc/webconference.conf.sample
+@sample %%ETCDIR%%/sems.conf.sample
+lib/sems/audio/annrecorder/beep.wav
+lib/sems/audio/annrecorder/bye.wav
+lib/sems/audio/annrecorder/confirm.wav
+lib/sems/audio/annrecorder/greeting_set.wav
+lib/sems/audio/annrecorder/to_record.wav
+lib/sems/audio/annrecorder/welcome.wav
+lib/sems/audio/annrecorder/your_prompt.wav
+lib/sems/audio/beep.wav
+lib/sems/audio/conference/beep.wav
+lib/sems/audio/conference/first_participant.wav
+lib/sems/audio/default_en.wav
+lib/sems/audio/precoded_announce/test.predef
+lib/sems/audio/voicebox/0.wav
+lib/sems/audio/voicebox/1.wav
+lib/sems/audio/voicebox/10.wav
+lib/sems/audio/voicebox/11.wav
+lib/sems/audio/voicebox/12.wav
+lib/sems/audio/voicebox/13.wav
+lib/sems/audio/voicebox/14.wav
+lib/sems/audio/voicebox/15.wav
+lib/sems/audio/voicebox/16.wav
+lib/sems/audio/voicebox/17.wav
+lib/sems/audio/voicebox/18.wav
+lib/sems/audio/voicebox/19.wav
+lib/sems/audio/voicebox/2.wav
+lib/sems/audio/voicebox/20.wav
+lib/sems/audio/voicebox/3.wav
+lib/sems/audio/voicebox/30.wav
+lib/sems/audio/voicebox/4.wav
+lib/sems/audio/voicebox/40.wav
+lib/sems/audio/voicebox/5.wav
+lib/sems/audio/voicebox/50.wav
+lib/sems/audio/voicebox/6.wav
+lib/sems/audio/voicebox/60.wav
+lib/sems/audio/voicebox/7.wav
+lib/sems/audio/voicebox/70.wav
+lib/sems/audio/voicebox/8.wav
+lib/sems/audio/voicebox/80.wav
+lib/sems/audio/voicebox/9.wav
+lib/sems/audio/voicebox/90.wav
+lib/sems/audio/voicebox/and.wav
+lib/sems/audio/voicebox/bye.wav
+lib/sems/audio/voicebox/first_new_msg.wav
+lib/sems/audio/voicebox/first_saved_msg.wav
+lib/sems/audio/voicebox/in_your_voicebox.wav
+lib/sems/audio/voicebox/msg_deleted.wav
+lib/sems/audio/voicebox/msg_end_menu.wav
+lib/sems/audio/voicebox/msg_menu.wav
+lib/sems/audio/voicebox/msg_saved.wav
+lib/sems/audio/voicebox/new_msg.wav
+lib/sems/audio/voicebox/new_msgs.wav
+lib/sems/audio/voicebox/next_new_msg.wav
+lib/sems/audio/voicebox/next_saved_msg.wav
+lib/sems/audio/voicebox/no_more_msg.wav
+lib/sems/audio/voicebox/no_msg.wav
+lib/sems/audio/voicebox/pin_prompt.wav
+lib/sems/audio/voicebox/saved_msg.wav
+lib/sems/audio/voicebox/saved_msgs.wav
+lib/sems/audio/voicebox/x1.wav
+lib/sems/audio/voicebox/x2.wav
+lib/sems/audio/voicebox/x3.wav
+lib/sems/audio/voicebox/x4.wav
+lib/sems/audio/voicebox/x5.wav
+lib/sems/audio/voicebox/x6.wav
+lib/sems/audio/voicebox/x7.wav
+lib/sems/audio/voicebox/x8.wav
+lib/sems/audio/voicebox/x9.wav
+lib/sems/audio/voicebox/you_have.wav
+lib/sems/audio/voicemail/beep.wav
+lib/sems/audio/voicemail/default_en.wav
+lib/sems/audio/webconference/0.wav
+lib/sems/audio/webconference/1.wav
+lib/sems/audio/webconference/2.wav
+lib/sems/audio/webconference/3.wav
+lib/sems/audio/webconference/4.wav
+lib/sems/audio/webconference/5.wav
+lib/sems/audio/webconference/6.wav
+lib/sems/audio/webconference/7.wav
+lib/sems/audio/webconference/8.wav
+lib/sems/audio/webconference/9.wav
+lib/sems/audio/webconference/beep.wav
+lib/sems/audio/webconference/entering_conference.wav
+lib/sems/audio/webconference/first_participant.wav
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