Well turns out that my first impression of lack of documentation isn't entirely correct, as it turns out that there isn't really much to do, which is a hell of a lot different to LBG!
Virtually just assign the licence, generate the welcome e-mail, install the client, and you are away. There are some questions that I still have around how it should be best integrated on MAS, but it works, so that is the main thing.
The main gripe with the documentation is that there is not one mention of MiVoice in the MAS 5 engineering guide, etc, which is where it all should be!