The underlying problem is that the "Password OK" from the Cisco
server is being processed by Windows TAPI software as an "OK" from a
modem, which it is not.
This problem can be solved by u
Cisco routers with digital modems require that an "X" character be
placed in front of any DTMF data (dual tone multi-frequency) that is
sent in a dial string after a phone number. For more