Multitech MultiVOIP MVP130-AV-FXS, Быстрый старт

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Phonebook Tips
MultiVOIP Quick Start Guide 42
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