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Modem 2 calls Modem 1 telephone number CALLING MODE modem 1 answers and initiates communicaiton Modem 2 detects connection, Dial-Up Modem Process modem 1 waits for a call... ANSWER MODE Modem 2 calls Modem 1 telephone number CALLING MODE, Modem 2 detects connection both modems agree on carriers... Data is transferred and application instructs termination of call