I couldn't connect to my isp in linux since the modem was upgraded from 33.6k to 56kflex standard. I managed to dial to 28.8k modem pool but failed when dialing to 56k modem pool. I am sure my isp is using k56flex also. I believe the hardware is functioning since I can use the same modem to dial to 56kflex line in win95/nt.
My linux ppp scripts is :
pppd connect 'chat -v "" ATDTtel_no CONNECT "" \
Username: username word: password dialin ppp' \
/dev/cua1 57600 -detach debug crtscts modem defaultroute
and my linux version is 2.0.30 and ppp is ppp2.2