Linux telefooncentrale
Asterisk, bouw je eigen voip centrale met open source software
http://www.asterisk-voip.nl/
Open Sources Revolution
Open Sources Revolution
http://www.oreilly.com/catalog/opensources/book/toc.html
Tucows Linux Howto!
Tucows Linux Howto!
http://howto.tucows.com/
Using Samba
Using Samba
http://www.oreilly.com/catalog/samba/chapter/book/index.html