very very interesting. i could also see this service as walletRTC we could implement it in NU or other coin!
I dont think they are first
Phone Number CBDEs receive a phone number and extension they may use for voice mail, teleconferencing and outgoing calls. Fees for this service are charged according to use, and deducted from your account automatically. See prices for details.
http://cryptobiz.directory/services.html#phone
