Try
http://en.askedu.net/Australia/VoIP_1.htm and find one that looks like it might work for you
You will find that while there are theoretical degrees from universities and technology specific from a manufacturers, there are no recognised equivalents to the more practical 'I can do it!' City and Guilds.
You might be better advised to follow the route most of us have taken, dig up some software and a PC and teach yourself?