Jay,
  These specifications are documented in Bell Communications Research
BELLCORE LEC Notes on the Network, its an expensive document and can be
purchased directly from them.  I think its 1-800-THE-CORE.  DTMF level is
specified in this document from 0 to -27 dB.

Regards
Larry K. Stillings
Compliance Consultant
66 Baptist Road
Canterbury NH 03234
603-783-9022
[email protected]

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