It will be very difficult, though not impossible, to achieve CCVP with no voice experience. The value of doing this would certainly come into question. I would recommend finding a position where you can gain experience or building a lab for experience. Nothing replaces getting your hands on the equipment. That being said, reading will start you down the right path and give you some knowledge of voice protocols, QoS, etc. Please find a list of books and a link to some good information on Cisco's website below.
http://www.ciscopress.com/title/1578702275
http://www.ciscopress.com/title/1587050757
http://www.ciscopress.com/title/1587201240
http://www.ciscopress.com/title/1587050501
http://www.ciscopress.com/title/1587051575
http://www.ciscopress.com/title/1587051923
http://www.cisco.com/en/US/tech/tk652/tsd_technology_support_category_home.html
Hope this helps. If so, please rate the post.
Brandon
