A client has an issue with her 56k dial-up modem, doesn't connect at all, but did connect the other day. Physical connection is OK and a regular phone at that location works just fine. No further elaboration; the following inquiry is general and to be applied in my work on all modems.
1) Apart from the Windows Control Panel self-test, what other special tests can be run(DOS or Windows based)
2) Are there third party utilities available which excel at modem testing? If so, which ones and why?
3) What else might I do to correct a flaky modem problem?