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[Sindi Keesan <keesan AT iamjlamb.com>]

I tried unsuccessfully to use the AT+MS string someone posted for V90 and 
then read up on the problem at www.56k.com/trouble/interop.shtm

The +MS is Rockwell only and they suggest for Rockwell, to specify V90 
only and not K56Flex:  +MS=12,1,34667,56000

For Lucent:
Apollo or Mars, enable V90  -V90=1  (disable it with 0)

For Lucent Venus:  V90 only - S38-0

USR:
Sportster:  X2 off, V90 on (after upgrading?)  S32=34
Courier:   S58=1

Other modems might also work with the Sportster command.

I have not yet tried the above, but +MS kept my modem from dialing at all.