[Blink] DTMF not supported
thom at union.waw.pl
Thu Jul 22 13:22:55 CEST 2010
1. With inband, I think that provider has nothing to say - it's just a voice. A device receiving DTMF is Alcatel A4625 IVR - it's using NMS Communications boards for ISDN lines and DTMF detection is made on it's DSPs.
2. Bria/X-Lite have no such problems - so, it's not remote problem. Ok, when I press a dtmf key on Bria with a very very short hit, it's also not recognized, but sending it a little longer (in Bria signal is send as long key is pressed) it's working fine. So, thats why I'm saying about duration.
3. And finally, I think that compression should not matter (at least not so much) - mobile phones have much worse quality, and inband dtmf signals, are not a problem.
I'm IVR applications developer and soft phone is very helpful for me (till now I've used hard phones) until dtmf is working right :)
So, is it a big problem to make dmtf duration a little longer? For test purposes, it can be a hidden parameter eg in plist.
Wiadomość napisana przez Adrian Georgescu w dniu 2010-07-22, o godz. 11:50:
> You are the only person reporting this problem and the DTMF functionality is a widely used library used in many SIP comercial and open-source implementations on many problems.
> I have a feeling that the problem you experience is with your provider rather than this library.
> On Jul 22, 2010, at 11:40 AM, Tomasz Muszynski wrote:
>> Wiadomość napisana przez Adrian Georgescu w dniu 2010-07-22, o godz. 00:29:
>>> What codec do you use?
>>> "Tomasz Muszynski" <thom at union.waw.pl> wrote:
>>>> Ok, I've checked again and it seems that my provider recognizes DTMF's from Blink (with and without Inband set), but with problems. I have to press digit many times to be recognized - sometimes it works quite ok, but most time it's not recognizing any digits, even after hundred of key presses (that's why I was thinking that it's not working).
>>>> I'm not sure, but I think that DTMF signal may be to short. Is it possible to make it longer? Ideally, according to classic phones, DTMF signal should generated be as long as key is pressed.
>>>> It's not remote problem, because from X-Lite it's working ok (it sends DTMF signals as long as key is pressed).
>>>> Wiadomość napisana przez Adrian Georgescu w dniu 2010-07-20, o godz. 18:16:
>>>>> DTMF using INFO method is obsolete. It will not likely be built into Blink.
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