How traditional systems work: Via chain of PSTN providers: If buyer’s PBX would know direct path to seller: Improve call quality and reliability No multiple re-codings No extra fees That’s why was “invented” ENUM (rfc6116)

ENUM - E.164 NUmber Mapping (rfc6116) a suite of protocols to unify the telephone system with the Internet “Address book” to find the path to a certain IP PBX by a telephone number serviced by it. Wiki: Telephone_number_mapping In above example above, ENUM works as follows: Seller registers his IP PBX in ENUM server When calling, Buyer’s IP PBX makes a query to ENUM server, trying to find a “shortcut” to Seller’s bypassing the PSTN network If shortcut exists, Buyer’s PBX uses it. If not, it uses conventional PSTN way and pays landing fees

Why ENUM is not popular? PTSN providers are not interested to publish their shortcuts in ENUM No place to register for individual/business phone owner Non-transparent ENUM resolving rules, depend on proprietary service owner logic Critical dependence on some single provider Bottleneck in a centralized resolver Vulnerability vs service malfunction or attack to DNS infrastructure.

ENUMER = ENUM + EmeR = Decentralized ENUM

ENUMER - blockchain-based decentralized ENUM Anyone can register his own number Transparent ENUM resolving rules, configurable by PBX owner Decentralized nature, independent from any company or other provider Local and instant resolving - no bottleneck, no dependence of ENUM server health or DNS infrastructure Much better call connection time than through PSTN - ~0.2s vs ~3s Possibility to use HD audio/video codecs and TLS/SRTP, what is unavailable on PSTNs.

Thus ENUMER makes the ENUM system: Fast Reliable Protected Highly scalable (to any extent) Not depend on anybody (cannot be blocked, spoofed, hacked etc.) Transparent algorithm of resolving addresses Configuration through local software No need to add some code to your current PBX software

ENUMER is already used by: www.portaone.com/solutions/blockchain www.portaone.com/success-stories/portaone-emercoin-blockchain ezuce.com/ezuce-emercoin-speed-adoption-blockchain-phone-video-services

More info about ENUMER: bit.ly/ENUMER

Our contacts:

One blockchain - lot of services! Some services beside ENUMER:

http://bit.ly/ENUMER Meet us 4-5 May at chainges.co, Amsterdam