-=> Quoting Craig Ford to Terry S <=-

 CF> Those modems which incorporate support for MNP10 will also generally
 CF> include the capability of negotiating BTLZ over MNP4.

Zoom's 14k4 originally did not support MNP10 but still fully met V42bis
irrespective of error correction employed - especially V42 fallback
negotiation action

rgdZ
Richard

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