原型实现：Web控制台与多个SIP电话终端建立语音会议

                case /"^66[1-9][0-9][0-9][0-9]$":
                        # starting with 99 folowed by ABCD - direct call to broadcast play
                        strip(2);
                        prefix("p2p-");
                break;

                case /"^99[1-9][0-9][0-9][0-9]$":
                        # starting with 99 folowed by ABCD - direct call to broadcast play
                        strip(2);
                        # online - do broad bridging
                        prefix("broad-");
                break;
                case /"^77[1-9][0-9][0-9][0-9][0-9]$":
                        # starting with 77 folowed by ABCDE - direct call to broadcast play
                        strip(2);
                        # online - do conf bridging
                        prefix("conf-");
                break;
                default:
                        # online - do bridging
                        prefix("kb-");

    <extension name="Local_Extension_kamalio_p2p">
      <condition field="destination_number" expression="^p2p-([1-9][0-9][0-9][0-9])$">
        <action application="export" data="dialed_extension=$1"/>
        <!-- bind_meta_app can have these args <key> [a|b|ab] [a|b|o|s] <app> -->
        <action application="bind_meta_app" data="1 b s execute_extension::dx XML features"/>
        <action application="bind_meta_app" data="2 b s record_session::$${recordings_dir}/${caller_id_number}.${strftime(%Y-%m-%d-%H-%M-%S)}.mp4"/>
        <action application="bind_meta_app" data="3 b s execute_extension::cf XML features"/>
        <action application="bind_meta_app" data="4 b s execute_extension::att_xfer XML features"/>
        <action application="set" data="ringback=${us-ring}"/>
        <action application="set" data="transfer_ringback=$${hold_music}"/>
		<action application="set" data="call_timeout=50"/>
	    <action application="set" data="proxy_media=true"/>
		<action application="set" data="sip_invite_domain=192.168.16.35"/>   
		<action application="export" data="sip_contact_user=ufs"/>

		<action application="export" data="sip_contact_host=192.168.16.35"/>
        <action application="export" data="sip_contact_port=5060"/>

		<!-- <action application="set" data="sip_exclude_contact=${network_addr}"/> -->
		<action application="set" data="record_concat_video=true"/>
        <action application="set" data="hangup_after_bridge=true"/>
        <!--<action application="set" data="continue_on_fail=NORMAL_TEMPORARY_FAILURE,USER_BUSY,NO_ANSWER,TIMEOUT,NO_ROUTE_DESTINATION"/> -->
        <action application="set" data="continue_on_fail=true"/>
        <action application="hash" data="insert/${domain_name}-call_return/${dialed_extension}/${caller_id_number}"/>
        <action application="hash" data="insert/${domain_name}-last_dial_ext/${dialed_extension}/${uuid}"/>
        <action application="set" data="called_party_callgroup=${user_data(${dialed_extension}@${domain_name} var callgroup)}"/>
        <action application="hash" data="insert/${domain_name}-last_dial_ext/${called_party_callgroup}/${uuid}"/>
        <action application="hash" data="insert/${domain_name}-last_dial_ext/global/${uuid}"/>
        <!--<action application="export" data="nolocal:rtp_secure_media=${user_data(${dialed_extension}@${domain_name} var rtp_secure_media)}"/>-->
        <action application="log" data="INFO in to extension public-ex user/$${dialed_extension}@$${domain_name}"/>
		<action application="hash" data="insert/${domain_name}-last_dial/${called_party_callgroup}/${uuid}"/>
		<action application="set" data="RECORD_DATE=${strftime(%Y-%m-%d %H:%M)}"/>
		<!-- <action application="answer"/>-->
		<!-- <action application="record_session" data="av://$${recordings_dir}/${dialed_extension}_${caller_id_number}_${strftime(%Y-%m-%d-%H-%M-%S)}/${call_uuid}.mp4"/> -->

        <!-- 修改这部分内容，其中192.168.16.83为kamilio的IP -->
		<action application="bridge" data="sofia/internal/$1@192.168.16.83"/>

		<action application="answer"/>
		<!-- <action application="sleep" data="1000"/> -->
        <!--
        <action application="bridge" data="loopback/app=voicemail:default ${domain_name} ${dialed_extension}"/>
	-->
		<!-- <action application="record_fsv" data="$${recordings_dir}/${dialed_extension}_${caller_id_number}_testrecord.fsv"/> -->
		<action application="record_session" data="av://$${recordings_dir}/${dialed_extension}_${caller_id_number}_${strftime(%Y-%m-%d-%H-%M-%S)}.mp4"/>

      </condition>
    </extension>