On Sun 16 Feb at 05:58 Bill Grimsley (3:640/305.9{at}fidonet) wrote to Arthur Marsh:

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?

OK, suppose you have a multi-function device. If you were calling a fax
machine you'd want to send fax CNG tones. If you were calling a modem you
(might) want to have V.25 calling tones sent. If you were calling a V.18
tty, you might want to send the V.21 signal.

Regards,

Arthur.

--- msgedsq 2.1