在/usr/local/freeswitch/conf/dialplan/default.xml文件里，<extension name="Local_Extension">节下面

    <action application="set" data="RECORD_TITLE=Recording ${destination_number} ${caller_id_number} ${strftime(%Y-%m-%d %H:%M)}"/>  
    <action application="set" data="RECORD_COPYRIGHT=(c) 2020"/>  
    <action application="set" data="RECORD_SOFTWARE=FreeSWITCH"/>
    <action application="set" data="RECORD_ARTIST=FreeSWITCH"/> 
    <action application="set" data="RECORD_COMMENT=FreeSWITCH"/> 
    <action application="set" data="RECORD_DATE=${strftime(%Y-%m-%d %H:%M)}"/>  
    <action application="set" data="RECORD_STEREO=true"/>
    <action application="set" data="enable_file_write_buffering=false"/>
    <action application="set" data="media_bug_answer_req=true"/>
    <action application="record_session" data="$${base_dir}/recordings/archive/${strftime(%Y-%m-%d-%H-%M-%S)}_${destination_number}_${caller_id_number}.wav"/>

其它拨号方案，需要录音的地方也如此添加。 

media_bug_answer_req=true

为true时，接通后录音。