If you're using an older version of Asterisk, an upgrade can be beneficial not only for DTMF, but for security and bug fixes as well. Some versions of Asterisk 1.4 actually send both inband and RFC2833 when you have RFC2833 enabled. Older versions of Asterisk (pre-1.4, usually) have trouble with RFC2833 or other DTMF modes.
In this case, try setting RFC2833 as the DTMF.
On the contrary, some devices (Linksys, IP phones) require you to set a DTMF mode. This is accomplished by editing the trunk or sip.conf to remove any reference to lines like "dtmfmode=rfc2833" or "dtmf=inband." This will let Asterisk negotiate DTMF based on the SIP/SDP. Some Teliax users report that removing references to a DTMF mode on their Asterisk-based PBXs (trixbox, FreePBX, etc.) will resolve DTMF issues. This method was designed to signal digit presses as a SIP signaling packet, however it is difficult to use end-to-end and in a multi-carrier environment.ĭTMF usually works without incident, but i f you're having trouble with DTMF tone recognition on your Asterisk-based PBX you can try some of the following remedies. Inband tone generation, usually known as "inband." Using this method, the audible tones are generated just like speech. Almost 100% of VoIP carriers support and prefer this method. RFC2833 (recommended!), the time-tested and IETF-approved RTP DTMF signaling method. With VoIP, DTMF is delivered using one (or more) of the following methods: This is useful for audio navigation of menu systems, IVRs, and phone trees.
Modified on: Fri, 27 Jul, 2018 at 7:42 PMĭTMF allows key-presses on inbound and outbound calls to be recognized by a phone system capable of decoding and registering these tones. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.Solution home FAQs Support FAQs Dual-tone multi-frequency (DTMF), or TouchTones While the information provided in believed to be accurate, it may include errors or inaccuracies. This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights.
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