[Freeswitch-users] DTMF: liberal-dtmf=true vs dtmf_type=none

[Richard Brady]

Any FreeSWITCH DTMF pros in the house?


On 5 October 2012 14:44, Richard Brady <rnbrady at gmail.com> wrote:

> Hi folks
>
> I am try to prevent DTMF tones from being transmitted from one channel to
> another on a bridge by adding the following:
>
>   <action application="export" data="nolocal:dtmf_type=none"/>
>
> This will prevent tones from the inbound channel from being transmitted on
> the outbound channel. Nifty!
>
> However, it also prevents RFC2833 from being advertised on the outbound
> channel and this is problematic in cases where suppression is required in
> the forward direction but not the reverse.
>
> Setting liberal-dtmf=true on the profile does not help, it appears that
> dtmf_type=none in the dialplan (or dtmf-type=none in the profile) overrides
> liberal-dtmf in the profile.
>
> I would like to file a bug arguing that liberal-dtmf has inconsistent
> behaviour. For example, it will override the dtmf-type=none
> profile parameter in SDP offers but not in SDP answers. It makes sense that:
>
> * dtmf-type/dtmf_type should influence offers and answers alike, as well
> as what is used for outgoing DTMF and what is recognised as incoming DTMF,
> and
> * liberal-dtmf should override dtmf-type for offers and answers alike, as
> well as for what is recognised as incoming DTMF, but
> * liberal-dtmf should not override what is sent as outgoing DTMF, since
> that would make the dtmf-type parameter completely impotent.
>
> Does anyone have any thoughts / suggestions / rebuttals?
>
> Thanks,
> Richard
>
> FreeSWITCH Version 1.3.0+git~20121002T220322Z~d84df73aaa (git d84df73
> 2012-10-02 22:03:22Z)
> Vanilla config except for addition of the above line to Local_Extension in
> default.xml dialplan.
> Ubuntu 12.04.1 LTS
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.freeswitch.org/pipermail/freeswitch-users/attachments/20121024/209004e3/attachment.html