[Freeswitch-users] Greetings and a couple of questions

[Doc]

Once you mentioned the in-band versus out-of-band DTMF, it made sense.  
I've been reading on it since your post, and I'm going to try a few 
things.  Wonder if there is any app for voice controlled IVR (so many 
systems seem to support it these days, it would be a nice way to 
circumvent the DTMF issue... :-) ).

Any ideas on the rest of my points?   -Thanks,

Scott Torr wrote:
> On Tue, 16 Feb 2010 20:53 -0600, "Doc" <ledoktre at meanie.us> wrote:
>   
>> 1) I am able to see a call come in, and it gets routed to the sample IVR 
>> to start.  The first thing off is that when I dial from PSTN -> 
>> Skype-In, it does not let me push any buttons.  If I launch a second 
>> skype client, and dial the skype user on FS directly, it works fine.  
>> Any ideas?
>>     
>
> Hi Doc,
>
> When you dial in from the PSTN the 'push button' events are present as
> "in band" audio tones.
> By default the sample IVR only works on "out of band" DTMF events.
>
> This is why when you call directly from another skype client the 'push
> button' events are detected because they are passed as "out of band"
> signaling.
>
>
> Now,
> In the dial plan you can tell FS to listen for "in band" audio DTMF
> tones using <action application="start_dtmf" />
>
> However,
> This currently does not work during a skype call for some reason?
> http://jira.freeswitch.org/browse/MODSKYPIAX-66
>
>
> A work around,
> is to sign up for the "Skype SIP Beta" product where the 'push button'
> events are sent to FS "out of band".
>
> This conversion is done at the PSTN --> Skype gateway by dedicated DTMF
> tone detection hardware.
>
>
> Skype has either made a business decision, or a technical over sight to
> pass DTMF events 'out of band' for only addition fee products.
>
>
> It has also been reported in New Zealand that even the 'in band' tones
> where present one day and actually filtered out the next.
> This seems extreme, but either through deliberate action or a technology
> change this is what was reported on one blog.
>
> It is unclear to me if this was a technical limitation or a blunt
> business decisions, but a audio sample showed the audio tones missing? 
>
>
> In any case you would not want to rely on 'In band' DTMF' tones when
> passed through 'lossy' codecs anyway.
>
> Best to stick with 'out of band' signaling for reliability.
>
>
> regards,
> Scott Torr
>
>
>
>
>
>
>
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