Not to flog a dead horse, but...

https://www.mitel.com/mitel-training

Mitel offers virtual classroom and on-site leader-led classes.

Also, if your boss expected you to "Own the Network" for something like HP-UX or ADA or something else that you didn't already know, he would pay to have you trained on it. You can't take time off to train? You shouldn't have to. Either he should pony up for it, or he should allow you to set up virtual classroom training.

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