這是本文件的舊版！

sound redirection

receive sound via SSH

ssh <user>@<remotehost> 'arecord -f cd -t raw | oggenc - -r' | mplayer -
ssh <user>@<remotehost> ffmpeg -f alsa -ac 1 -i hw:3 -f ogg - | mplayer - -idle -demuxer ogg

send sound via SSH

arecord -f cd -t raw | oggenc - -r | ssh <user>@<remotehost> mplayer -
ffmpeg -f alsa -ac 1 -i hw:3 -f ogg - | ssh <user>@<remotehost> mplayer - -idle -demuxer ogg

http://unix.stackexchange.com/questions/116919/redirect-sound-microphone-via-ssh-how-to-telephone-via-ssh

disable reverse dns

vim /etc/ssh/sshd_config 

UseDNS no