What's required to establish a dialup with Vodafone using GPRS on a GSM modem (MC35)?
I manage to get the CHAP/PAP authentication then as soon as IPCP starts negotiating the VOdafone server drops the connection with an LCP TermReq. NowSMS can do it so it's obviously possible - what's different?
It's possible that you need to set the proper APN (some people add an AT+CGDCONT command to the extra initialisation settings for the modem within Windows).