Hi Arthur,

 > It has appeared in the media, but people haven't understood that
 > an S12 exchange, having in-built echo-cancellers can detect the
 > 2100 Hz tone with phase reversals of an echo-cancelling modem
 > (V.32/V.32bis/V.34) answering a call and pass this information
 > on to measuring/billing software by means of a software upgrade
 > only.

Does this mean that if we go back to 300 bps modems this method of
detecting data calls will not work ?

Can an old ARE exchange detect data calls?

Regards, Malcolm.


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