On Thu 22 Aug at 10:39 Peter Collis (3:713/914.16) wrote to Arthur Marsh:

 AM> If it were a HST-only modem, it would probably answer 
 AM> with 2100 Hz *without* phase reversals (or possibly even 
 AM> the Bell 2225 Hz answer tone, which I encountered once 
 AM> when calling South Africa).

 AM> If it supports V.32/V.32bis/V.34 it would answer with 
 AM> 2100 Hz incorporating phase reversals which would be 
 AM> detected by the echo cancellers.

 PC> So two Couriers in HST mode might get away with it.

Yes.

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