At 10:04 2003-06-13 -0600, you wrote:
But we get this message all the time though on normal voice calls and it's
not because we're calling fax machines or modems.

The tone is put in by long-distance voice network echo cancellers -- calls over 400 miles IIRC. This prevents multiple ECs from trying to echo-cancel the conversations.


So it's not just a fax/modem tone. It's a Bell-standard telephone-network EC tone.

--
 Moshe Yudkowsky
 Disaggregate
 2952 W Fargo
 Chicago, IL 60645 USA

<http://www.Disaggregate.com>

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