[Asterisk-Users] dtmfmode and IAX protocol

Fri Feb 11 13:51:16 MST 2005

> There's enough information if he's using FWD's 8XX-gateway for his 
> toll-free calls to UPS, the bank, etc.

No there isn't. We don't know how the Sipura is configured, we don't
know for sure what the associated sip def's are, we don't know exactly
what path was used to dial each call (eg, x100p, tdm, fwd), etc. All
we know is something doesn't work via fwd, but calls via something
to the bank and fedex work. We do know that fwd-iax wants g711, and if
that path is being used for all calls, you'd have to guess that
at least one or two dtmf digits would get through to the destination
and cause invalid number messages. Since he didn't mention that, its
highly likely his path to the bank and fedex are different then the
fwd path. 

> First of all, if the wiki says "inline" (yes, okay, it does) it 
> probably means as inline data as opposed to "inband." But the fact is 
> that iax2 ALWAYS sends DTMF out-of-band.
> 
> While it's true that some VOIP phones (SIP adapters, etc) can be 
> configured to send DTMF inband, I would think that doing so while using 
> IAX is going to result in digits being reproduced twice at the 
> destination--once from the DTMF reproduced from out-of-band and once 
> from the inband DTMF. So if you're using IAX as your trunking protocal 
> you need to use out-of-band DTMF on your IP phones (and adapters) as 
> well.
> 
> Why does DTMF work sometimes and not all of the time? Heck, if I knew 
> that then I wouldn't have this problem where inband DTMF hardly ever 
> works properly for any of my inbound calls over IAX from Voicepulse. 
> I'm starting to think that Asterisk's support for DTMF over IAX has 
> issues but I'm too stubborn to switch to SIP and test that. I know I 
> don't have any (zero, nada, keine, rien, etc.) problems navigating 
> Asterisk IVR menus via my SIP adapter.
> 
> It's important to keep in mind, however, that the telco environment 
> beyond your Asterisk box, beyond FWD (Voicepulse, Broadvoice, Vonage, 
> etc.) is a complicated environment where everyone isn't playing by the 
> same set of technical specs. The fact that any of this stuff actually 
> works as well as it does is just amazing in itself.
> 
> -mark
> 
> On Feb 11, 2005, at 1:17 AM, Rich Adamson wrote:
> 
> > Joseph has been working at bringing up an asterisk box as kind of a
> > newbie, and I think he's using a Sipura as his fxs interface into
> > asterisk. He's having a problem with asterisk passing dtmf to FWD,
> > but didn't say how he's accessing the bank or fedex. So, without
> > a fair amount more detail from him, there's no way to answer his
> > questions or guess at the problem.
> >
> > ------------------------
> >> Exactly. (I was hoping he'd come to his own conclusions.) So... if the
> >> Sipura does not do IAX, then it's quite possible that you're not 
> >> doing IAX
> >> on the Sipura. Which means the whole "dtmfmode and IAX protocol" is 
> >> moot...
> >>
> >> -Michael
> >>
> > -------------------------
> >> No.
> >>
> >> ------------------------
> >>
> >>> Can the Sipura SPA-3000 do IAX?
> >>> -Michael
> >>>
> >>> -----Original Message-----
> >>> From: asterisk-users-bounces at lists.digium.com
> >>> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Joseph
> >>> Sent: Thursday, February 10, 2005 10:50 PM
> >>> To: Asterisk Users Mailing List - Non-Commercial Discussion
> >>> Subject: RE: [Asterisk-Users] dtmfmode and IAX protocol
> >>>
> >>> Actually, I don't know what might be the problem.
> >>> I'm using Sipura SPA-3000 unit connected to standard cordless phone
> >>> and connecting to FWD over IAX
> >>>
> >>> 1.)
> >>> If I call FedEx or Bank and enter my account number using numeric 
> >>> keys
> >>> it works
> >>>
> >>> 2.)
> >>> If I dial UPS 1-800-742-5877 and try to use one of the option 
> >>> provided
> >>> it doesn't work.
> >>>
> >>> Could it be their phone system?
> >>>
> >>> -- 
> >>> #Joseph
> >>>
> >>> On Thu, 2005-02-10 at 21:36 -0600, Michael Giagnocavo wrote:
> >>>> Actually, there are some phones that will do inband DTMF over IAX2. 
> >>>> So
> >> if
> >>>> he's using one of these, he has to make sure his settings are 
> >>>> correct.
> >>> Yes,
> >>>> the PA168 phones. The correct setting is RFC2833 for IAX (inside 
> >>>> these
> >>>> phones). Otherwise it's inband. The other options they provide just 
> >>>> cut
> >>> the
> >>>> call.
> >>>>
> >>>> -Michael
> >>>
> >>>
> >>> _______________________________________________
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> >>>
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> >>
> >> ---------------End of Original Message-----------------
> >>
> >>
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> >>
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> > ---------------End of Original Message-----------------
> >
> >
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> --
> Mark Eissler, mark at mixtur.com
> Mixtur Interactive, Inc. - at - http://www.mixtur.com
> 
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