User guide

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