My problem turned out to be related to the quality of my phone line. In response to an email US Robotics support mailed me a very helpful message. I extract the most significant part here.
***** Begin extract from US Robitics message *****
"EVALUATING LINE CONDITIONS FROM ATY11 AND ATI11...
I recently bought two used Courier V.Everything V.90 external modems, model 00280600, on eBay. Both have difficulty establishing V.90 connections. I have tested them on calls to several local ISPs with the same disappointing results. I might suspect my phone lines except I have three other...
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