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https://freeswitch.org/confluence/display/FREESWITCH/mod_dptools%3A+start_dtmf
Do not use the start_dtmf application and the mod_dptools: start_dtmf_generate application together. If both are running at the same time you will cause a feedback loop to occur within FreeSWITCH itself, such that a DTMF tone from a caller will result in repetitive DTMF tones being identified by FreeSWITCH.
https://freeswitch.org/confluence/display/FREESWITCH/DTMF
Detect DTMF using Goertzel and drop samples identified as containing DTMF tones. Regenerate the detected DTMF tones on the opposite leg. This AFAIK is the only DTMF intercept mode supported by FreeSWITCH ATM. 3. DTMF options. FreeSWITCH attempts to negotiate rfc2833 DTMF out-of-band transmission. TODO RFC 2833 is obsoleted by RFC 4733.
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation of proprietary telecom switches to a versatile software implementation that runs on any commodity hardware. From a Raspberry PI to a multi-core server. FreeSWITCH can unlock the telecommunications potential of …
https://freeswitch.org/confluence/display/FREESWITCH/mod_dptools%3A+start_dtmf_generate
As an example, placing this in the dialplan prior to bridging a call will allow a phone set to rfc2833 OR info to send DTMF tones inband out to the recipient (IVR) or Auto Attendants. Thus changing the outgoing routing from info or rfc2833 to inband. TODO RFC 2833 is obsoleted by RFC 4733. 3. Notes
https://freeswitch.org/confluence/display/FREESWITCH/Switch+core+variables
The following variables are set by FreeSWITCH after the channel is hung up, and contain timestamps for various state changes for a channel. ... asr_intercept_dtmf. ... This permits you to easily support multiple languages by only changing a single variable at call time.
http://lists.freeswitch.org/pipermail/freeswitch-users/2015-January/110752.html
I've been working on a configuration to solve the same problem. In my case it's a simple in-and-out bridging configuration on a single sofia profile, where the a-leg can be inband or RFC2833 an any number of codecs, but the b-leg must be inband on G.711u.
https://freeswitch.org/confluence/display/FREESWITCH/mod_sofia
About. mod_sofia is the SIP endpoint implemented by FreeSWITCH. Configuration sofia.conf.xml accept-blind-authtrue,false accept-blind-regtrue,false aggressive-nat-detectiontrue,false aliasarbitrary all-reg-options-pingtrue,false apply-candidate-aclacl apply-inbound-aclacl apply-nat-aclacl apply-proxy-aclacl apply-register-aclacl auth-all-packetstrue,false auth-callstrue,false auth ...
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