Toll restriction or toll denial is a feature offered by
telephone
A telephone is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most efficiently the human voice, into e ...
companies which allows a
line
Line most often refers to:
* Line (geometry), object with zero thickness and curvature that stretches to infinity
* Telephone line, a single-user circuit on a telephone communication system
Line, lines, The Line, or LINE may also refer to:
Arts ...
to be so programmed that it is impossible to originate
long-distance calls from that line, or to accept charges reversed to the number by other parties. Such lines usually allow calls to be made to no-charge numbers locally and toll-free (under the
North American Numbering Plan
The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the international callin ...
, area codes 800, 844, 855, 866, 877 and 888), so customers can still make some long-distance calls.
Most commonly this restriction is applied at the request of the owner of the premises, who does not wish to be subject to unlimited liability for costly unauthorised calls made by others at the site. Restriction of calls to overseas or
premium-rate telephone number
Premium-rate telephone numbers are telephone numbers that charge callers higher price rates for select services, including information and entertainment. A portion of the call fees is paid to the service provider, allowing premium calls to be an ...
s are common options on some systems, such as
voice over IP
Voice over Internet Protocol (VoIP), also called IP telephony, is a method and group of technologies for the delivery of speech, voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. The terms In ...
.
Private branch exchange
A business telephone system is a multiline telephone system typically used in business environments, encompassing systems ranging in technology from the key telephone system (KTS) to the private branch exchange (PBX).
A business telephone syst ...
clients are often able to configure toll restriction on a per-extension basis through the local PBX, either blocking all trunk calls or requiring that a numeric password be dialled to complete the call.
Telephone companies may sometimes require high-risk-account customers, or those requiring basic phone service for security and health reasons, to accept toll restriction.
Telephone service enhanced features
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