U.S. patent (Pat. No. 9,516,480) for Verify, the N
Post# of 82672
This appears to be what they have patented specifically. If anyone has more info on this I'd love to hear it as Vonage would be another HUGE company to go after and they have a HUGE multi-national client base as well.
https://www.nexmo.com/blog/2017/01/25/nexmo-r...-s-patent/