It seems to be a VERY though thing to do. I did find one place that offers training courses, Perpetual Solutions. You might just have to spend a lot of time on Google to find a place near your location. Founf this on another site, kind of funny, so I know your frustration.
I did call them but they said without a Technician ID we wont be able to help you.
Me: “How can I get a technician ID?”
Mitel: “You should be a “Certified Mitel Engineer”
Me: “But this is why I’m calling, I want to know how can I get trained to be Mitel Engineer?”
Mitel: “Sorry without a technician ID we can’t help you!”