Dear Charlie:
If you hop to http://www.gocertify.com and search on VoIP or VOIP, you'll see that numerous organizations offer certs in this area, including the likes of Alcatel, Cisco (one of the Cisco qualified specialist credentials focuses on IP telephony), and Nortel, among others. Let the vendors or equipment in use in your current (or planned future) place of employment help guide you into some specific program, and you'll be ready to declare yourself a VoIP specialist when you've made it through the requisite training.
Good luck!
--Ed--
SearchNetworking.com also has a tip on Convergence training. You can view it here: VoIP training
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