PE> Also BTW, does this mean the USR Courier is violating the V34 spec,
PE> since it has no problem calling the Viper?

BG> Not at all.  It means that the Courier's old default of S54=0 (V.8 CI 
BG> enabled) has been changed to S54=64 (disabled), presumably because of that 
BG> very problem, where some fax/modems can't discriminate correctly between 
BG> V.8 CI and fax CNG tones.  I think you'll find that V.8 Call Indicate is an 
BG> optional part of the V.34 spec anyway, as its use certainly isn't mandatory 
BG> for V.34 connects.

Now that I know the correct terminilogy :-/, I looked up the standard,
and it says that the Calling modem will wait to hear either ANS or
ANSam as defined in the V.8 spec, and then it shall transmit CI, CT or
CNG, also defined in V.8.  

The answering modem has to stay quiet for 200ms, then transmit 
ANSam, and then receive CM, and POSSIBLY other tones.

ANSam
CI
CM

are defined in the V.8 recommendation.  So is CNG and CT, they just
aren't listed in the same place.

So, the CI tones are presumptious, but not illegal.

Whatever all those tones mean, anyway!

BTW, this was for "duplex" operation.  Can someone remind me what the
difference between full duplex and half duplex is?

BFN.  Paul.
@EOT:

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