Do SIP Services depend on the emergence of a global ENUM system?
SIP and ENUM are often lumped together, but SIP does not technically “need” ENUM. At its most basic, ENUM simply translates phone numbers into IP service addresses; services that are not addressed with phone numbers do not need ENUM. However, it is clear that phone numbers are not going anywhere anytime soon. Even when people choose a name to dial on our mobile phones, the underlying infrastructure uses a phone number — and for someone addressing a service to the IP world from the PSTN world, a telephone number is the only choice. In addition, services that are NOT SIP-based can also benefit from ENUM; we’ve cited the MMS example as one that already exists. In summary, ENUM and SIP are not codependent. (Having said that, SIP services will be rolled out in a world where services will interoperate between the PSTN and the IP world, and ENUM will certainly ease adoption of SIP services as a result.) IMS standards — all of them — assume the need for an inter-party addressing environment ba
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