Wow! We can always count on you to dig in where no one else dares to go.
Nicely done, Figment! Next topic: Digits, Tones, and Talk-Off: Leif Madsen demystifies DTMF > -----Original Message----- > From: Leif Madsen [mailto:[EMAIL PROTECTED] > Sent: February 21, 2006 10:38 AM > To: Ian Service > Cc: TAUG > Subject: Re: [on-asterisk] Persistent DTMF Issue > > On 2/18/06, Ian Service <[EMAIL PROTECTED]> wrote: > > IRC seems to be useless for me on this one, so I figured > I'd try you > > guys before the bugs.digium folk. I'm running latest SVN on two > > asterisk machines. > > DTMF, my old enemy. > > I've done extensive testing with RFC2833 DTMF over the last > several months, and it seems to be everyones fault (Asterisk > and Cisco in my case, but I'm sure other devices as well). > I'll give a very brief overview here, but I encourage you to > read, and if appropriate, comment on the bugs already open as > opposed to opening a new bug. They can be found here: > > http://bugs.digium.com/view.php?id=5970 > http://bugs.digium.com/view.php?id=6027 > > 5970 is the more appropriate bug to comment on as it has much > more information about the real issue with RFC2833 in Asterisk. > > Basically, when you send DTMF via RFC2833 stylez, each digit > pressed will send 6 packets -- 3 start events and 3 end > events. If the far end recieves the 3 start events in order, > followed by 3 end events, then there is no problem and DTMF > is completed successfully. However, if the events arrive out > of order, then you end up with the far end detecting double > and triple DTMF (yes, this is a problem in Asterisk as well > (at least up to 1.2.1 where I did my testing)). > > One of the problems is that Asterisk sends all 6 events > almost instantaneously, which over the public Internet is > likely to arrive out of order due to jitter and latency. > There was an idea that placing some sort of delay between the > packets (and at the very least between the start and end > transition events) might help resolve the problem, but that > seems pretty hackish. > > Ideas welcome :) > > -- > Leif Madsen. > http://www.leifmadsen.com > http://www.oreilly.com/catalog/asterisk > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] For > additional commands, e-mail: [EMAIL PROTECTED] > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 267.15.12/265 - Release > Date: 20/02/2006 > > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 267.15.12/265 - Release Date: 20/02/2006
