Re: Difference between digital phone and VOIP

["Robert L Bass" <RobertLBass@xxxxxxxxxxx>]

> But why does (Cable systems) digital work
> and VOIP has so many problems?

There seem to be two problems that affect
signaling over digital lines.  First is latency,
the time taken for a packet of data to be sent
travel and be received.  The grerater the
latency, the more likely that the receiver will
decide the data is invalid.  Some systems
are simply faster.  However, even the fastest
ISPs can sometimes bog down during peak
usage hours (such as when Frank parses my
website... :)).

Another problem has to do with the codecs
used by the VoIP provider.  Codecs convert
analog sounds into digital data and back.
Some are very effective at handling DTMC
(Touchtone) codes such as are used by
Contact ID.  Others are not.  Obviously, if
you are using CID you'll want an ATA* device
that handles DTMF well.  Many of the ATA
devices which handle FAX machines well
are also good with alarm signals.

*ATA = Analog Telephone Adapter.

--

Regards,
Robert L Bass

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