* will only work reliably with alaw or ulaw audio codec. Their use is probably prohibited by most carriers. Ī, B, C and D keys are used rarely and exclusive for network control.įor example, the A key is used on some networks to cycle through different carriers at will. It is not possible to send other characters as DTMF because of the traditional telephone system standards. Having the proper DTMF type is required for browsing voice menus, call parking, etc. Other multi-frequency systems are used for signaling internal to the telephone network."ĭepending on the server setup, your VoIP provider might ask you to use a specific DTMF type. The version of DTMF used for telephone tone dialing is known by the trademarked term Touch-Tone, and is standardised by ITU-T Recommendation Q.23. "DTMF signaling is used for telephone signaling over the line in the voice-frequency band to the call switching center. Touch-tone is actually a registered trademark of AT&T and the generic name for signaling with tones is Dual Tone Multiple Frequency (DTMF) signaling. The following definition for DTMF comes from Wikipedia Touch Tone or DTMF To make pulse dialing faster, Touch Tone dialing was developed. This abbreviation stands for Dual- tone multi- frequency Inbound DTMF tones are currently not supported but that feature push is expected soon.All Zoiper products support DTMF signaling. When I call into my voicemail from my work phone, Ooma doesn’t recognize the buttons I’m pushing.
“Short dtmf” tones may be too short for the Ooma system to detect. Please check the manual for your phone for an option that allows for “long dtmf” tones to be emitted.
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