Need to disable V90/V92/56K modem speed

Connection failure with the BMDC-2 (Conexant softK56 / HSF) and latest windows driver (7.34.00.00)

For countless attempts, the modem stayed stuck at speed negociation time, making a high pitch noise. Another, different laptop connected fine in the exact same conditions.

Simple workaround: limit connection speed to 33600 by appending the following AT command: +MS=V34

Considering the number of similar web pages, this kind of issue seems quite common to a wide range of modem models.