[Asterisk-Dev] Bug 14 in bug tracker (fwd)

[Chris Heiser]

Mark,

FYI...

X-ten has e-mailed me and are working to resolve this odd implementation in
X-lite (I presume they'll check X-pro) so that it follows the RFC.  This is
the first DTMF problem I've come across where the duration field was the
problem.  Most issues I've seen have to do with the Sip endpoint ignoring
the SDP info from Asterisk.

--Chris Heiser

----- Original Message -----
From: "Mark Spencer" <markster at digium.com>
To: <asterisk-dev at lists.digium.com>
Cc: <support at xten.net>
Sent: Friday, July 25, 2003 1:57 PM
Subject: RE: [Asterisk-Dev] Bug 14 in bug tracker (fwd)


> It's a little of both probably.  Asterisk's handling of DTMF in RTP isn't
> proper either -- it is made around an attempt to be robust in handling
> good implementations, but that makes it sensitive to odd implementations.
>
> Mark
>
> On Fri, 25 Jul 2003, Peter Grace wrote:
>
> > I've done a workaround in rtp.c, but I know I'd prefer for the
> > solution to be concrete.  What exactly is wrong, so we can give the
> > xten people a good idea of what needs to be done?  From your message I
> > gather that the duration field is not being properly populated?
> >
> > On Fri, 25 Jul 2003, Chris Heiser wrote:
> >
> > > This actually appears to be a bug with the X-Lite Sip Phone.
> > > I've done some packet captures, and the X-Lite violates RFC2833.
> > >
> > > For the Payload of the RTP packet for DTMF, the RFC states:
> > >
> > > "   duration: Duration of this digit, in timestamp units. Thus, the
> > >            event began at the instant identified by the RTP timestamp
> > >            and has so far lasted as long as indicated by this
parameter.
> > >            The event may or may not have ended."
> > >
> > > X-Lite never increments the duration field of the RTP packets for DTMF
> > > digits.  I'm sure this is confusing Asterisk.  I'd say e-mail the
X-Lite
> > > folks and tell them they have bugs.
> > >
> > > --Chris Heiser
> > >
> > > > -----Original Message-----
> > > > From: asterisk-dev-admin at lists.digium.com [mailto:asterisk-dev-
> > > > admin at lists.digium.com] On Behalf Of Chris Heiser
> > > > Sent: Thursday, July 24, 2003 6:47 PM
> > > > To: asterisk-dev at lists.digium.com
> > > > Subject: Re: [Asterisk-Dev] Bug 14 in bug tracker (fwd)
> > > >
> > > > Peter,
> > > >
> > > > Can you send a tcpdump of the session between asterisk and the
X-lite
> > > > phone?
> > > >
> > > > Something like: tcpdump -s 0 -w xlite-phone-dump host [x-lite ip
address]
> > > > Make sure you run it while you're not logged in or otherwise
connected to
> > > > Asterisk (so the tcpdump only has the packets between the X-lite
phone and
> > > > Asterisk)
> > > >
> > > > I'd say just e-mail it to me direct as the file will probably be a
little
> > > > big to go out on the mailing list.
> > > > I've had to debug other DTMF issues with other devices.  (I've come
across
> > > > a
> > > > few sip UA's that ignore the SDP info that Asterisk sends out).
Maybe I
> > > > can
> > > > be of some help.
> > > >
> > > > --Chris Heiser
> > > >
> > > > ----- Original Message -----
> > > > From: "Peter Grace" <pgrace at fierymoon.com>
> > > > To: <asterisk-dev at lists.digium.com>
> > > > Sent: Thursday, July 24, 2003 3:54 PM
> > > > Subject: [Asterisk-Dev] Bug 14 in bug tracker (fwd)
> > > >
> > > >
> > > > > Oops.  Helps if you have the list address right.. See below!
> > > > >
> > > > > ---------- Forwarded message ----------
> > > > > Date: Thu, 24 Jul 2003 15:04:44 -0400 (EDT)
> > > > > From: Peter Grace <pgrace at fierymoon.com>
> > > > > To: asterisk-dev at digium.com
> > > > > Subject: Bug 14 in bug tracker
> > > > >
> > > > > Guys,
> > > > >
> > > > > I just fired in a bug report, but I'll give the rundown:
> > > > >
> > > > > http://bugs.digium.com/bug_view_page.php?bug_id=0000014
> > > > >
> > > > >
> > > > > X-Lite's DTMF problems with voicemail may not be X-lite's fault...
I
> > > > was
> > > > > tracking DTMF between rtp.c and channel.c and it looks like the
system
> > > > is
> > > > > ignoring the first couple digits.  Check the bug report for full
debug
> > > > > messages...
> > > > >
> > > > > Thanks,
> > > > > Pete
> > > > >
> > > > > _______________________________________________
> > > > > Asterisk-Dev mailing list
> > > > > Asterisk-Dev at lists.digium.com
> > > > > http://lists.digium.com/mailman/listinfo/asterisk-dev
> > > > >
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> > > > http://lists.digium.com/mailman/listinfo/asterisk-dev
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> > > http://lists.digium.com/mailman/listinfo/asterisk-dev
> > >
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> >
>
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