Behavior in data mode (+fclass=0), Behavior in voice mode (+fclass=8), Operation in data mode – Comtrol AT Commands User Manual

Page 77: Case 1: telephone line is in use, Case 2: telephone line is in use but disconnected, Case 3: telephone line is not connected to modem, Case 1:modem off-hook, local handset goes off-hook

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Behavior in data mode (+fclass=0), Behavior in voice mode (+fclass=8), Operation in data mode | Case 1: telephone line is in use, Case 2: telephone line is in use but disconnected, Case 3: telephone line is not connected to modem, Case 1:modem off-hook, local handset goes off-hook | Comtrol AT Commands User Manual | Page 77 / 206