CompTIA has decided to merge with the CTP exam and change Convergence+ into CTP+. The good news is that there really isn't a massive difference between the two exams. My Convergence+ book covers 70-80 percent of the material needed to pass the CTP+ exam; however, I have good news. We are in the process of writing a CTP+ book that should be out in the late part of the first quarter of 2011.
The book will include more coverage of networking technologies (such as cables, devices and protocols) as the CTP+ exam addresses these technologies with more emphasis than the Convergence+ exam did. Additionally, wireless networking will be covered in more detail and extensive coverage of VoIP protocols will be added (such as H.323, SIP, MGCP, RTP and RTCP). The VoIP protocols were covered in the Convergence+, but more depth is required for the CTP+ exam.
In the end, the CTP+ book will be larger than the Convergence+ book by around 125 to 150 pages. The exam itself, will be a more thorough evaluation of your VoIP and video over IP knowledge. Look for the book in early 2011 and, in the meantime, if you have questions feel free to ask.