I also thought the same until found that if I press buttons on my Treo650 too fast, DTMF tones did not get recognized by my Cisco IVR. I think there are different behaviours with different phones.
On 24 April 2006 04:52, Steve Underwood wrote: > Vahan Yerkanian wrote: > > Steve Underwood wrote: > >> With most cellular base stations each press of the > >> buttons on the phone produces a fixed length DTMF > >> pulse, with a fixed silence following it. If you press > >> keys in quick succession, they are buffered up, and > >> played out as tones at the pace the base station sees > >> fit. Typically they make the tones very long, for some > >> reason. 0.5 seconds in many cases. I think your > >> application sounds broken by design. I've been through > >> this before, trying to build things which require > >> rhythmic input. It just doesn't work, unless your > >> application is limited to plain old analogue land line > >> phones. > > > > DTMF buffer is another useful thing - currently digits > > sent too fast are guaranteed to be skipped. Ironically, > > I never get a double or skipped digits from cellular > > networks - these send DTMFs with loooong durations as > > the developers have accounted for lossy nature of the > > cellular technology. > > The lossy nature of cellular networks has no impact on > DTMF. The phones do not generate DTMF. The base stations > do. The phones merely send messages saying "user pressed > one", "user pressed five", etc. and they don't tell the > base station how long it was pressed for. The base > station generates the DTMF tone in a non-lossy > environment. > > Steve > > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-dev mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-dev _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-dev mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-dev