2. 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)

3. 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

4. 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.

5. ENUMER = ENUM + EmeR = Decentralized ENUM

6. 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.

7. 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

8. ENUMER is already used by:
ezuce.com/ezuce-emercoin-speed-adoption-blockchain-phone-video-services

9. More info about ENUMER:
bit.ly/ENUMER

10. Our contacts:

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

12.
Meet us 4-5 May at chainges.co, Amsterdam