Often when a modem was fried, it would offer the "no dialtone" error. I worked in a small dial-up ISP for several years and we saw failed modems regularly. The idea here is to determine what, if any, information the modem is capable of communicating through the phone line. Make note of changes in the tones of the handshake. If the modem initializes the line (clicks over to answer) then tryģ) hand dial the ISP from the same handset, when the ISP starts a handshake, enter "ATA" in the terminal window again. It's usually a good idea to be listening in with a phone plugged into the same line. This will push the modem to dial whatever number you replace for 55. Some of my favorites are from HyperTerminal command line.
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