So we switched back to Cablevision and it went pretty well, but apparently Verizon users can’t call our house number (ported from Verizon to Cablevision). Verizon users have to call from their mobiles in order to complete the call. I’m guessing that Verizon hasn’t updated their systems to indicate that they no longer “own” our number and is trying to route the call inside their network. Sucks because I can’t imagine Verizon jumping to help fix this since I’m not their customer anymore.
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Evan Hoffman's Blog 
As a followup, Cablevision resolved this by “rebroadcasting” our phone number, or something like that.