| 摘要 |
A communication apparatus and its control method which assure an execution of a polling communication in a state that an ECM transmit inhibition is selected while an ECM receive inhibition is not selected for communications in the ITU-T Recommendation V.8, V.21, V.27ter, V.29, V.17, or V.34, by executing a V.17 or lower transmission without executing a V.34 transmission if the ECM transmit inhibition is selected, by executing a V.17 or lower reception without executing a V.34 reception if the ECM receive inhibition is selected, and by executing a V.8 protocol for a reception so as to execute a V.34 reception if it is a receive operation or to shift to a V.17 or lower polling transmission if it is a polling operation and executing a V.17 or lower transmission for a transmission in a state that the ECM transmit inhibition is selected while the ECM receive inhibition is not selected.
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