MvdV> Hello Bo,

 JB>> :) dtmf tone dialing gives eveyone base-twelve and those who
 JB>> need it four more tones many modems can dial all 16 tones.
 JB>> (0123456789#*ABCD)

 BS> Where are the ABCD tones used? And for what purpose?

 MvdV> Over here they are used for caller identification. On 
 MvdV> analog lines the number of the caller is transmitted 
 MvdV> in DTMF to the receiver. To discriminate CID info 
 MvdV> from Direct dial in info, the number is boxed in 
 MvdV> between a 'C' and a 'D'.

Aha, I didn't knew, I did just think that the CID was sent on another
frenquenze like 27 KHz, which was formerly used for somekind of accounting
in this country.

Bo


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