NOTE:

While procedures that restrict dialing are very effective, absolute protection against misuse cannot be guaranteed. MLS- and MLC-model phones give more protection than standard phones. Therefore, we strongly recommend that you install MLS- and MLC-model phones where restricting phone use is important.

When an extension is allowed access to a Centrex line, you can use the following procedures to control calling for all lines to which the extension has access:

Outgoing Call Restriction (#401) provides the following choices:

No restriction allows outside calls to long distance and local numbers, and inside calls.

Local only allows outside calls to local numbers, and inside calls (make sure the Toll Call Prefix is set properly, using procedure #402).

Inside only allows inside calls only.

Disallowed Phone Number Lists (#404) creates lists of numbers that cannot be dialed. The numbers on a Disallowed List can be entire telephone numbers, or numbers of a certain type (such as all numbers in a particular area code). You can store as many as four different lists of up to 10 numbers each. For information on entering telephone numbers into lists, see “Entering Telephone Numbers into Lists” on page 4-18. (For programming information, see page 5-12.)

After you create the Disallowed Lists, use the Disallowed List Assignments (#405) procedure to assign one or more of the lists to a specific extension.

Night Service (with a System Password defined) restricts calling on Centrex lines by all extensions in the Night Service Group. Night Service (with or without a password) also causes after-hours calls to ring immediately at the extensions in the equipment Night Service Group, regardless of Line Ringing during normal day operation. See page 4-13 for details on Night Service.

Overriding Dialing Restrictions

The following programming procedures provide ways to override all equipment dialing restrictions, except those imposed by Line Access Restriction (the extension must have access to a Centrex line):

Emergency Phone Number List (#406) defines a list of up to ten numbers that can be dialed from any extension in the system. A typical Emergency number is 911. For information on entering telephone numbers into lists, see “Entering Telephone Numbers into Lists” on page 4-18. (For programming information, see page 5-12.)

NOTE:

A variety of factors influence the effectiveness of dialing restrictions. Avoid putting 800 numbers in your Emergency List. If you need to allow restricted users to dial 800 numbers, put those numbers in an Allowed Phone Number List (see page 4-18).

Customizing Your System 4-17

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AT&T II manual Inside only allows inside calls only, Overriding Dialing Restrictions

II specifications

AT&T II, a pivotal case in the landscape of telecommunications regulation, emerged from the expansive antitrust actions against the American Telephone and Telegraph Company (AT&T). Following World War II, AT&T had established itself as a telecommunications behemoth, monopolizing the market. The ramifications of this dominance spurred a significant shift in regulatory measures, leading to the dissolution of the Bell System in 1984, which consisted of AT&T and its regional operating companies.

One key feature of AT&T II is its emphasis on promoting competition in the telecommunications sector. The court's decision aimed to dismantle the monopolistic practices that had stifled innovation and restricted consumer choice. By encouraging competition among various service providers, the ruling paved the way for an environment where new technologies could flourish.

The technologies that emerged post-AT&T II significantly transformed the telecommunications landscape. The introduction of new digital switching systems allowed for improved call quality and increased network efficiency. The evolution of fiber-optic technology also played a crucial role, enabling faster transmission speeds and greater data capacity. Moreover, innovative services, such as mobile telephony and broadband internet, proliferated as competition increased.

Another characteristic of AT&T II is its focus on accessibility and consumer protection. The ruling mandated that telecommunications services be available to a broader swath of the population, ensuring that underserved communities had access to essential communication services. This shift not only democratized access but also laid the groundwork for the modern internet revolution, fostering the growth of the digital economy.

The impact of AT&T II can also be seen in the regulatory frameworks that followed. The Federal Communications Commission (FCC) adopted policies aimed at enhancing market transparency and ensuring fair practices among competitors. These regulatory changes helped to create a more equitable playing field, allowing smaller companies to compete against established giants.

In summary, AT&T II marked a turning point in telecommunications history, characterized by a focus on competition, technological advancements, and consumer protection. The dissolution of AT&T's monopoly allowed for the rapid evolution of technology and services, ultimately benefiting consumers and fostering an environment ripe for innovation. This ruling not only redefined the telecommunications industry but also set a precedent for how markets are regulated in the United States.