ENUM (Telephone Number Mapping) is a protocol that bridges traditional telephony and IP-based networks by converting standard phone numbers (E.164 format) into internet-based addresses using DNS. This enables VoIP systems to look up routing information and determine the best IP path for delivering a call, bypassing the public telephone network (PSTN) altogether when possible. ENUM essentially allows VoIP providers to connect calls directly over IP, improving efficiency, reducing cost, and avoiding unnecessary network hops. It supports interoperability between carriers and simplifies routing logic in multi-network environments. In large-scale deployments or global communications, ENUM helps eliminate redundant infrastructure and speeds up call handling by leveraging the internet for call resolution. For businesses looking to modernize their communication stack, ENUM is one of the behind-the-scenes technologies that make it happen.
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