"Clive D. W. Feather" wrote in message
...
In article , Stephen Osborn
writes
Actually the local exchange simply routes all numbers that start with a 0
to
the associated trunk exchange (properly called a DMSU, for Digital Main
Switching Unit).

False.

That is what I was told by my source in a telco. As I said (in a different
post)
my knowledge about network infrastructure is as it affects numbering.
Probably some Chinese Whispers along the way.

Oh, DMSUs have all been replaced by NGSs.

Well, they are still referred to as DMSUs by the (albeit non-hardware)
people telco I know.

If it is a non-geographic number (07*, 08*, 09*) the DMSU routes it to a
special platform that does really clever lookups.

Or routes it to another telco.

Indeed, I was simplifying.

--
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regards

Stephen