VoIP - Study materials?

Does anyone know where i can get some study materials for the above. Just about completed CCNA and would like to read up a bit before shelling out for certification.

TIA

hi,
try out " Cisco configuring Voip 2nd edition " . Its great for beginners . I have myself completed bout 150 pages and would recommend it to anyone who wants to get a grip in the Voip field.

....and just in case you are lookin to save some cash...then kazaa is the place

Hi,
You can download this ebook in www.net130.com
Have a good time!

hi
is there another resource where i could find the mentioned ebook by maximus?...the site i believe is in japanese and i can't make out of it...thank you so much...have a nice day...

hi to all

just want to ask if anyone was able to obtain a soft copy of the book mention by maximus with regards to VOIP...if it is not much of a trouble to you can you direct me to the site where i could download it? thank you very much...