[Freeswitch-users] Good book on (VoIP) telephony?

Hello I was wondering: For those of you experienced Freeswitch users, is there a good book on telephony that you would recommend for software people who have never worked in the telephony business and would provide a good basis to make sense of VoIP in general, and Freeswitch in particular? FWIW, here's what Amazon returns with "telephony": www.amazon.com/s/qid=1272412320/ref=sr_pg_2?keywords=telephony&rh=n:!1000,i:stripbooks,k:telephony Thank you. -- View this message in context: http://freeswitch-users.2379917.n2.nabble.com/Good-book-on-VoIP-telephony-tp... Sent from the freeswitch-users mailing list archive at Nabble.com.