First of all, I don't like VoIP Innovations. My personal experience with them was not good and I ran away immediately. Besides the technical requirements, there are some commercial ones that I totally disagree. A good customer and friend of mine told me they are now asking for a minimum 200 USD monthly charge. This means, regardless if you have one DID or much more, they will bill you always two hundred American dollars minimum. I have not confirmed that, and I don't want. But don't take it wrong, for a reason VoIP Innovation is very popular in the United States. They totally support the intrastate and interstate thing (something that I have only seen in the US) and they give native SMS support with SIMPLE SIP.
The FreeSWITCH (and the FusionPBX) work with VoIP Innovation trunk, but they won't work out of the box. There are some configurations you should do in the gateway configuration. It is not just that it is annoying, it is that there are many restrictions, and a minimum parameter sends a 503 error code right away, without any further explanation. So, for those poor souls who still need to deal with this carrier, I will put this useful notes.
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