The red keys in the fourth column produce the A, B, C, and D DTMF events.ĭual-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. Useful for a reality check on one-way audio or excessive audio delay.Autovon keypads were one of the few production units to include all 16 DTMF signals. ![]() The system will echo back in real time what you said. Have you ever called a voicemail system or bank by phone system and not been able to make menu selections? This test helps confirm the source of common “after connect” DTMF dialing issues on VOIP telephone systems and services.
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