The Basics of Telephone Number Mapping and Its Applications

Telephone number mapping is a process that allows you to connect a phone number to a specific device or location. This is typically done through a process called Number Porting, where you transfer your existing phone number to a new device or service provider.

In the United States, for example, Number Porting is regulated by the Federal Communications Commission (FCC), which ensures that the process is done efficiently and securely. The FCC also sets rules for how long it takes to complete the porting process, which is usually within 24 hours.

A key benefit of telephone number mapping is that it allows you to keep your existing phone number when switching to a new device or service provider. This can be especially helpful for businesses or individuals who have a established a brand or identity tied to their phone number.

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Telephone number mapping is the process of pairing telephone numbers with internet identification and addresses.

ENUM, or E.164 number to URI mapping, is a key part of this process, translating phone numbers into internet addresses like URL or IP addresses.

This allows users to dial a phone number and reach a SIP or IP telephony destination.

A server supported by ENUM will search for the dialed phone number within the ENUM tree of the DNS to see if there is an alternate way to connect the call.

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In the IMS network, ENUM servers work alongside DNS servers to map regular telephone numbers to SIP URIs of IMS subscribers.

The ENUM server contains an ENUM registry that stores the telephone numbers of all IMS subscribers in the network.

This registry is crucial for the IMS network to determine how to route calls, whether through the IMS network or the CS network.

The ENUM server performs a telephone number lookup when a user initiates a communication session.

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If the recipient's telephone number is an IMS subscriber, the ENUM server resolves the regular telephone number to an SIP URI and returns it to the IMS network.

The ENUM server returns an error if the recipient's telephone number is not an IMS subscriber.

During the LTE attach procedure, the network establishes an EPS Bearer between the UE and the PGW, which assigns an IP address.

The IMS network uses this ENUM server to know if the recipient's phone number is an IMS subscriber or not.

This helps the IMS network to decide if it will route the call through the IMS network or through the CS network.

Here's a breakdown of the ENUM server's role:

There are several types of ENUM implementations in use today. ENUM varieties can be confusing, but understanding the differences can help clarify things.

Public ENUM is the original vision of ENUM, a global, public directory-like database with subscriber opt-in capabilities and delegation at the country code level in the e164.arpa domain. It's also referred to as user ENUM.

ENUM varieties include Public ENUM, Open Enum, Private ENUM, and Carrier ENUM, each with its own unique characteristics.

Here's a breakdown of the different ENUM varieties:

The called party facility is a key aspect of ENUM, allowing users to opt-in and publish their ENUM number, along with their preferences for call termination.

This service enables the called party to decide how they want their call to be handled, whether it's via VoIP, fixed-line PSTN, or cellphone, and even specify multiple options.

ENUM indirect dialling solves the problem of deciding how to establish a call, as it's the called party's wishes that matter, not the caller's.

The called party can also change their phone telco, webpage, or other telecom services without having to notify all their contacts, thanks to ENUM's flexibility.

A presence-enhanced ENUM facility can automatically switch between different call termination options, such as cellphone and VoIP, based on the called party's availability.

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There are four main varieties of ENUM implementations in use today. Public ENUM is the original vision of ENUM as a global, public directory-like database, with subscriber opt-in capabilities and delegation at the country code level in the e164.arpa domain.

ENUM can be categorized into different types, each with its own purpose. Public ENUM is one of them, but what's the difference between Public ENUM and the other types?

Public ENUM is not the only type of ENUM out there. Open Enum is another implementation that involves mobile carriers and other parties generating a complete, public database of all international numbering plans, available via public DNS.

Private ENUM is used by carriers, VoIP operators, or ISPs within their own networks, similar to how DNS is used internally. This type of ENUM is not publicly accessible.

Carrier ENUM is a type of ENUM where groups of carriers or communication service providers share subscriber information via ENUM in private peering relationships. The carriers themselves control the subscriber information, not the individuals.

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Here are the different types of ENUM implementations in a concise table:

Each type of ENUM has its own unique characteristics, and understanding these differences is essential for navigating the complex world of ENUM.

Telephone number mapping is a game-changer for businesses and organizations. By mapping phone numbers to specific teams, departments, or even individuals, you can streamline your customer service and improve response times.

With telephone number mapping, you can create a customized directory that routes calls to the right person every time. This reduces the likelihood of calls being lost or mishandled, and ensures that customers get the help they need quickly.

In fact, a company that implemented telephone number mapping saw a 30% reduction in average call wait times. This is a huge win for customer satisfaction and loyalty.

By mapping phone numbers to specific teams or departments, you can also improve your team's productivity and efficiency. This is because calls are no longer being routed to the wrong person or team, reducing the need for transfers and hold times.

For example, a hospital that mapped its phone numbers to specific departments was able to reduce the average call wait time for emergency services from 10 minutes to just 2 minutes. This is a huge improvement that can make all the difference in a medical emergency.

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Telephone number mapping has a fascinating history that dates back to the early days of telephony. The first telephone exchange was established in 1877 by Alexander Graham Bell, the inventor of the telephone.

The first telephone exchange used a simple switchboard to connect calls, which was a major innovation at the time. This early switchboard was a manual system that relied on operators to connect calls by physically plugging wires into a switchboard.

The first telephone exchange was established in Boston, Massachusetts, and it marked the beginning of a new era in communication. From this humble start, telephone exchanges grew rapidly, and soon they were connecting calls across the globe.

The introduction of automatic telephone exchanges in the early 20th century revolutionized the industry, making it possible to connect calls quickly and efficiently. This was a major breakthrough that paved the way for the modern telephone networks we use today.

Telephone number mapping has come a long way since its early days, and it continues to evolve with new technologies and innovations.

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ENUM is a telephone number mapping system that unifies the international PSTN with internet addressing. It uses the Domain Name System (DNS) to locate services associated with E.164 addresses.

Most 11-digit phone numbers are part of a global numbering plan specified by the International Telecommunications Union (ITU) in Recommendation E.164. This plan is crucial for the convergence of classic telephone service and Internet telephony.

The Electronic Number Mapping System (ENUM) developed by the IETF uses existing E.164 telephone numbers, protocols, and infrastructure to indirectly access different services available under a single personal identifier. ENUM permits connecting the IP world to the telephone system in a seamless manner.

Being able to dial telephone numbers the way customers have come to expect is crucial for the convergence of classic telephone service and Internet telephony. This is why ENUM is an essential component of this convergence.

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