Before
we look at ISDN in more detail, a quick summary of the benefits
are;
DDI - Direct Dialling Inwards gives the ability to have multiple
telephone numbers even with a small number of lines, (or channels
in ISDN speak).
This allows for fax machines, PDQ's, private lines, alarms,
etc, to be connected through the company telephone system
making significant savings on line rental costs. See
Fig1. It also facilitates the ability to answer the phone
in different company names or department names, (as these
names will show on the LCD display of most modern phone systems,
so the user only has to read the screen as they answer the
call). It also gives the ability to analyse the response to
different advertising and marketing initiatives, dial direct
to an individuals desk, bypassing the switchboard,(private/direct
number).
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