Ya, voicemail isn't the strongest - I noted in that email
that a VM would
probably (hopefully) do 2833. But there are plenty of PSTN
gateways which
don't do 2833. In fact I've heard that's where the INFO
usage for dtmf got
born. There are also plenty of Enterprise hard-phones that
apparently don't
do 2833. Nor do most H.323 devices. Considering how much
INFO-dtmf is
demanded and used, I assume it must be a large set of
devices or apps that
don't do 2833.
But yeah the credit-card-style apps are the obvious users.
For some of them
KPML could save a lot, for example to reduce a 16-digit
credit card number
to one Notify. Ironically KPML rewards apps which use a lot
of DTMF digits
all the time, and penalizes those that use only a few or
uses them
infrequently.
-hadriel
> -----Original Message-----
> From: Francois Audet [mailto:audet nortel.com]
> Sent: Monday, September 10, 2007 4:09 PM
> To: Hadriel Kaplan; Brian Stucker; Eric Burger
> Cc: sip
> Subject: RE: [Sip] INFO
>
> Ah.... Good point. Hadn't tought of that.
>
> In any case, I'm not sure voicemail is the best
example. Seems to me
> you are more likely to use RFC 2833 for voicemail,
since it's a
> media server. Furthermore, you'll for sure be dealing
with people
> leaving voicemails that are NOT SIP users and would be
going through
> a generic PSTN-SIP gateway (which would do RFC 2833).
>
> I'd think that KPML is more useful for features that
don't terminate
> media, like the Calling card example, or *gasp*
invocation of feature
> codes, and where the end-user device is known to be a
SIP phone.
>
>
> > -----Original Message-----
> > From: Hadriel Kaplan [mailto:HKaplanacmepacket.com]
> > Sent: Monday, September 10, 2007 12:42
> > To: Audet, Francois (SC100:3055); Stucker, Brian
> > (RICH1:AR00); 'Eric Burger'
> > Cc: 'sip'
> > Subject: RE: [Sip] INFO
> >
> > But most calls to a voicemail server DON'T
actually use DTMF,
> > I've been told
> > - since most calls to a vmail server are to leave
messages.
> > Calls to retrieve voicemail do always use dtmf,
but calls to
> > leave voicemail don't.
> > However calls to leave voicemail usually have the
optional
> > ability for the caller to send DTMF - for example
pressing
> > "*" and then the passcode to retrieve
voicemail, or "0" to
> > reach an attendant, or some button to cancel the
recording,
> > etc. Only a fraction of those calls actually end
up with
> > someone pressing a dtmf button, but because you
*could* press
> > dtmf, the vmail server would have to KPML
subscribe for all calls.
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