Multi-Tech Systems MVP210-SS User Manual download pdf (Page 48)

QS: Phonebook Tips MultiVOIP User Guide

(b) access codes. There are digits (PSTN access codes) that must be

dialed to gain access to an operator, to access the publicly switched

‘long-distance’ calling system(North America), to access the publicly

switched ‘national’ calling system (Europe and elsewhere), or to access

the publicly switched ‘international’ calling system (worldwide).

There are digits (PBX access codes) that must be dialed by phones

connected to PBX systems or key systems. Often a “9” must be dialed

on a PBX phone to gain access to the PSTN (‘to get an outside line’).

Sometimes “8” must be dialed on a PBX phone to divert calls onto a

leased line or to a voip system. However, sometimes PBX systems are

‘smart’ enough to route calls to a voip system without a special access

code (so that “9” might still be used for all calls outside of the building).

There are also digits (special access codes) that must be dialed to gain

access to a particular discount long-distance carrier or to some other

closed or proprietary telephone system.

(c)

local exchange numbers. Within any calling area there will be many

local exchange numbers. A single exchange may be used for an entire

small town. In cities, an exchange may be used for a particular

neighborhood (although exchanges in cities do not always cover easily

discernible areas). Organizations like businesses, governments,

schools, and universities are also commonly assigned exchange

numbers for their exclusive use. In some cases, these organizational-

assigned exchanges can become non-localized because the exchange is

assigned to one facility and linked, by the organization’s private

network, to other sometimes distant locations.

(d)

specialized codes. Some proprietary voip units assign, to sites and

phone stations, numbers that are not compatible with PSTN

numbering. This can also occur in PBX or key systems. These

specialized numbers must be handled on a case-by-case basis.

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Multi-Tech Systems MVP210-SS User Manual Page 48