On Mon 17 Feb at 18:19 Dave Hatch (3:711/808{at}fidonet) wrote to Bill Grimsley:

BG>> Precisely, although a software producer could always 
BG>> utilise V.8 Call Indicate tones for that purpose, I 
BG>> guess...

AM>> V.8 Call Indicate tones can be the T.30 Fax CNG tone, 
AM>> the V.25 modem calling tones, or a V.21 signal defined 
AM>> in V.8.

BG> Stoppit Arthur, you're confusing me!  Please excuse my 
BG> obvious ignorance, but how the hell can specifically 
BG> different standardised tones or signals be used as 
BG> substitutes for each other?  That's somewhat akin to 
BG> suggesting that say V.32bis, V.FC, and V.34 are all 
BG> identical, and interchangeable, is it not?

 DH> Nope - he's saying that each of those (seperate and 
 DH> distinct) protocols includes an approved and known "calling 
 DH> tone".   But Of Course, all of the blighters are different.   
 DH> Standards are wonderful - everyone has one.

So that if you hear V.25 tones, you can assume it's a modem or
multifunction device, but if you hear T.30 CNG tones, you can assume
someone wants to send you a fax (-:.

--- msgedsq 2.1