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]
