> 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.

You keep mentioning the S12s, but what about AXE?  There are a hell of a
lot of these, up this way anyway, some of which have only recently been
deployed, or repositioned to replace older ARE and even some extant
crossbar gear.

Ian

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