Problem resolved.I contacted Freserve.Their answer is that "V92 modems do sometimes have difficlties connecting. To solve this problem load V90 drivers.We are currently investigating suppoting the advanced features of the v.92 standard,and will be in touch when we have more information" Old V90 modem loaded, now runing at 46667 !!!
It's interesting to read the question of speeds for V90 and V92. Last year I joined ntlWorld and could not connect to them via my WinModem Conexant HCF V90. Apparently it would not speak to theirs! So I had to buy another modem. I got a V92 and connected OK but always at 44k or less. I have now reverted back to BT and have tried both modems, and now use the original V90 and connect at 99.99% of the time at 49333. (I use WIN98SE along with a manully installed dial-up connection, not the BT one from the disc they supply.) Not unreasonable, except that I now have a spare V92 modem that I didn't really want to buy in the first place!!