The promo came by email; they granted permission to repost it in this forum: "We are giving away 10 free On-net USA or UK numbers. For US, Boston and New York are available. For UK, London 0208 / Manchester or Sheffield are available."
You can get up to 10 numbers in one city, or mix and match across the available locations. The service is completely free, with no setup or monthly charges and no charge for incoming calls. Each DID is hard-limited to two channels; a 10,000 minute monthly limit applies to the entire offer.
The promotion is not automated -- send an email to dids@voxbeam.com mentioning "FREE USA and UK DIDs" with your specific request. In my case, I asked for a 1-646-740-XXXX, a 1-617-372-XXXX and a 44-208-XXX-XXXX. Of course, you can only get numbers in blocks assigned to Voxbeam and cannot pick specific numbers. You also need to provide the address where they will initially send calls, e.g. myserver.mydomain.com:5060, though you can change this later from the customer portal. They provisioned the DIDs within a few hours and they all work fine.
I don't know whether an unfunded account (you get a small credit at signup) is eligible, but suspect that if you ask nicely your request will be granted.
If appears that you can do failover via DNS SRV (not tested) and you can of course do manual failover by changing the destination host on the portal or via DNS. You can specify multiple destinations on the portal, but none of the options are useful for failover, unless the servers are always 'hot'.
There is no incoming CNAM and I don't know whether outbound CNAM is available, or whether a charge applies.
Blocked caller IDs do get though, though you will need to look in both P-Asserted-Identity and Remote-Party-ID for the calling number.
RDNIS is supported but my attempt at testing it failed for reasons unrelated to the DID.
No SMS, though they may allow a split port.
Offer expires 12/31/2016, though you should probably enter your request well before the holidays.
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