You need some PBX knowledgement.
If run into any problems (no ringing, no voice, one-way audio, outgoing calls, oncoming calls, , ,),
DIY.
Absolute an CEO of a small phone company. and your customers keep complaining forever, they are your LD, honey, girls, boys, , ,
I do run this PBX myself years, since google launched this service, more than three years ago.
In my memory, it doesnot cover Hawaii nor Canada. But I could be wrong at this time.