I just need somebody who can port over about a dozen inbound phone numbers, and provide a trunk to my PBX.

Alternately, I'd be fine with paying a reasonable fee to use somebody else's VoIP PBX.

I need a provider who will actually handle a port for me. I tried to switch from Teliax to VoicePulse, and ended up with most of the numbers not ported, and nobody on either side seeming to care about this fact.