The same thing was done during the transition from mechanical analog switching 
to electronic analog matrix and digital switching.  All the clunks and thunks 
that marked the progress of call connection largely disappeared with electronic 
analog and digital switches.   So the switch vendors added artificial progress 
tones/noises just to give the caller that comfort factor that a connection was 
still in progress ... 

it's kind of silly when you think about it, but turns out to be pretty 
important in the overall user interface .. :-)

Grant/NQ5T


On Feb 3, 2010, at 4:52 PM, Alan Bloom wrote:

> 
> people think they were disconnected.  So they had to add a little
> "comfort noise" to let people know everything is still working.

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