Phone system for construction trailer recommendation

I need to set up phones for a construction trailer.  Does anyone have any experience with any VOIP/virtual PBX providers?

The office will be around for about two years.

I have in the past set up a small PBX (Avaya Partner ACS) and used phone lines from Vonage.  The PBX worked really well (voice mail, auto attendant, two line speaker phones, etc.)  Vonage for phone lines worked ok but I would like something better.

Anyone know other vendors similar to Vonage but with better call quality/reliability?
Who is Participating?
A very high rated firm for hosted business services is Alteva.
Another firm that worked well for a client was 8x8
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