Jack Hamilton (jfh@acm.org) Sat, 04 Mar 2006 19:25:08 -0800

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sonali <sonali.shelke@gmail.com> wrote: > Hi all! > I wanted to know what sequences are sent when we press * and #. Touch tones are also known as DTMF, or dual-tone multi-frequency. There are 4 "low" tones and 4 "high" tones. They combine, two at a time, to create the 16 standard DTMF signals. There's no sequencing involved in * and # - they're just two of the combinations. The other 4 combinations, which you're not likely to have on your phone, are A, B, C, and D. I have them on an amateur radio Handi-Talkie, where they might be used to control radio repeaters. They were originally intended for military use. See <http://en.wikipedia.org/wiki/DTMF>. > also, what sequences are sent for international calls? what happens > when the sender tries to morph his identity ?what sequences are sent > in such a case? You may be thinking of trunk signaling, which I know nothing about. Jack Hamilton California <> Qui vit sans folie n'est pas si sage qu'il croit. <> François VI, duc de La Rochefoucauld

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