tone 電話

Use for debates discussions speaking. DTMF was first developed in the Bell System in the United States and became known under the trademark Touch-Tone for use in push-button.

Hk Old Telephone British Hong Kong Kong Hong Kong

Dual-tone multi-frequency signaling DTMF is a telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers.

. English lesson on MOBILE TELEPHONES. ESL Conversation Lesson Questions.

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