![]() KeypadThe DTMF keypad is laid out in a 4×4 matrix, with each row representing a low frequency, and each column representing a high frequency. ![]() 2.7 DTMFmode for SIP client configurationĭual-tone multi-frequency signaling (DTMF)DTMF is used for telecommunication signaling over analog telephone lines in the voice-frequency band between telephone handsets and other communications devices and the switching center.2.5 Changing DTMF tone frequency in Asterisk.1 Dual-tone multi-frequency signaling (DTMF).
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