For example, to open IRLP 6556, the operator will press the talk button on the microphone and then press the digits 6556 also on the microphone.Įach letter and number is allocated a pair of tones, a high tone and a low tone, using the same DTMF frequencies as on telephone landlines. In practice today, most hams will only use numerical combinations. The DTMF system was developed to encompass as wide a range of potential signals as possible. RFC 4733 is only used over networks that use RTP. Mobile networks always send DTMF out of band, as they use codecs that won’t support DTMF (an acoustically coupled DTMF sender is unlikely to work over a mobile phone). It is sometimes known as tone dialing and allows the user to send a series of tones that activate or disable a remote repeater or service. If the phone decides on which DTMF method to use or the telephony provider etc. DTMF is used in ham radio in applications such as IRLP and Echolink, as a means to dial outside numbers via phone patch and as a means for repeater owners to configure the system remotely.
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