The
features of ISDN probably benefit small companies more than
large organisations, (despite some misconceptions, it is not
price prohibitive, in fact it often reduces a company's telecom
spend).
When anyone tries to extol the virtues of ISDN, they usually
site advantages such as, speed of transmission and quality
of speech, but this only scratches the surface.
From a voice telecom point of view it all boils down to extra
pieces of information which are sent down the line (or channel
in ISDN speak), each time a call is made.These extra pieces
of information allow modern telephone systems to perform a
bucketful of sexy functions and these functions bring some
very real benefits to the customer.
Most people have probably heard of these extra pieces of
information but are not aware of all the advantages they bring.
They are DDI (Direct Dialling Inwards) and CLI (Calling Line
Identity).
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