[Freeswitch-users] Any experience with DTMF from FreeSwitch to Sonus with Vega ATAs?

[Yehavi Bourvine]

Hello Steve,

  Thanks for clarifying it.

                     __Yehavi:

2011/2/20 Steve Underwood <steveu at coppice.org>

> Hi Yehavi,
>
> Section 3.2 of RFC2833 is poorly worded, and causes a lot of issues in
> the real world. The first paragraph says you can choose to send both
> audio and events, but doesn't clarify how. Presumably RFC2198 should be
> used. Is your system using RFC2198 encoding? I doubt it. The second
> paragraph talks about tone onset getting through as audio. Valid DTMF
> can be as short as 45ms, so 60ms is far more than anything which might
> be termed onset. Because they didn't specify anything about what is
> tolerable as tone onset passing through the channel as audio we have
> chaos today.
>
> RFC2833 is an obsolete spec, and we should be talking about RFC4733
> today. Section 2.5.1.3.1 of RFC4733 does clearly call for combined
> payloads to be sent as RFC2198 packets. RFC4733 is even vaguer about the
> onset issue, though.
>
> Steve
>
>
> On 02/20/2011 06:33 PM, Yehavi Bourvine wrote:
> > Hello Steve,
> >  I uderstand from paragraph 3.2 in RFC-2833 that the sender may send
> > some audio of the DTMF while sending the events, until it revognises
> > that this is a DTMF tone. The 60mSec is what I've been told by Vega
> > engineers.
> >                                Thanks! __Yehavi:
> >
> > 2011/2/20 Steve Underwood <steveu at coppice.org <mailto:steveu at coppice.org
> >>
>  >
> >     On 02/20/2011 03:31 PM, Yehavi Bourvine wrote:
> >     > Hello,
> >     >   Anyone has an experience with the above configuration? All
> >     sides are
> >     > marked as RFC-2833 and the Sonus recognises most of the DTMF's
> >     twice.
> >     > The Vega sends both RFC-2833 events and about 60msec of the DTMF
> >     tone
> >     > (according to Vega's engineers it takes it about 60 msec to
> >     detect the
> >     > DTMF tones).
> >     > According to the RFC this is acceptable. The service provider I am
> >     > working with says that it shouldn't be like that. Before I waste
> >     time
> >     > in wars, has anybody had this issue and knows whether it is a
> matter
> >     > of configuration at the Sonus side?
> >     >                                    Thanks! __Yehavi:
> >     Are you saying the Vega sends 60ms of DTMF as audio, then sends
> >     RFC2833
> >     DTMF packets and mutes the audio? In what reading of the RFC is that
> >     considered appropriate action? In addition, a DTMF detector should
> >     detect is more like 40ms. 60ms is rather long.
> >
> >     Steve
> >
> >
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