-=> Quoting Lance Lyon to Jasen Betts <=-

 LL> Hi Jasen,
 
 
 > what does C represent in a dial string?
 
 > my modems generate a tone for the C does anyone know what
 > that tone is for?

 LL> Can't find anything in any of my modem manuals for that - sounds
 LL> non-standard, what modem do you have ? 
 LL> Here's an address for the Hayes command set, again, nothing in there :

 LL> http://fan.nb.ca/cfn/info/help/com-prog/modemcommandslist.html

All the Rockwell chipsets for at least the last 5 years will generate
the A, B, C, and D tones.

Whether the manufacturer of a given modem will *document* it is a
different matter.
--- FMailX 1.60