Jean-Pierre,
To answer to your question, Caller ID is enabled on my phone line and works with a couple of telephones and a Verizon Caller ID box. I found a statement on a web site that although a modem may respond correctly to the Caller ID mode command, it still may not actually have the necessary circuitry installed. The same web site phrased it another way: "A modem may not know whether it has Caller ID or not." I think this is probably the case with the modem I tried first. I tried the modems in two of my other PC's and they also do not support Caller ID. It looks like I will have to buy another modem to get Caller ID support. Thanks for your help.
Allen