Greetings ( + )!( + )
On Jul 31, 2005, at 11:19 AM, James Fraser wrote:
Too bad you can't do that any more, or at least not commonly. With the
conversion to CCIS (Common Channel Interoffice Signaling), you don't
hear
about blue boxes the way you once did. This is because CCIS puts the
control tones out-of-band (out of the normal band of telephone
transmission).
Tones haven't been used for signaling since the introduction of CCIS, a
digital message is sent in the common channel. This system transformed
into what was known as SS7 (Signaling System 7) and now the most
current form of telecommunications signaling is SS8 (Signaling System
8).
Best Regards, /\*_*/\
Harry (*^_^*)
I know, when people see a cat's litter box, they always say, "Oh, have
you got a cat?" Just once I want to say, "No, it's for company!"
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