I'm experiencing errors on end-end DTMF  which I suspect may be due to
speech path degradation.  (Symptom: some IVR systems are incorrectly
interpreting my key presses. I've tried using several different
phones.)

Is there any way for me to check the reception of digits, akin to an
an echo test?

Basicallly I want to press the digits 0-9 *and #  numerous times and
have some machine either speak back each key press in turn or
otherwise record the overall success rate against a known template
(i.e it tells me what keys to press, and I then press them).

I'm using VoIP but in case others might know of a solution I've
cross-posted to uk.telecom

TIA

--
Mark

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Mark wrote:
> I'm experiencing errors on end-end DTMF  which I suspect may be due to
> speech path degradation.  (Symptom: some IVR systems are incorrectly
> interpreting my key presses. I've tried using several different
> phones.)
>
> Is there any way for me to check the reception of digits, akin to an
> an echo test?
>
> Basicallly I want to press the digits 0-9 *and #  numerous times and
> have some machine either speak back each key press in turn or
> otherwise record the overall success rate against a known template
> (i.e it tells me what keys to press, and I then press them).
>
> I'm using VoIP but in case others might know of a solution I've
> cross-posted to uk.telecom
>
> TIA
>

Some VoIP codecs are very likely to distort DTMF signals.
Do you know which one you are using?  There are techniques
for relaying these signals out-of-band.

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On Thu, 26 Jan 2006 15:25:26 +0000, Jim <me2@my.net> wrote:

[snip]

>Some VoIP codecs are very likely to distort DTMF signals.
>Do you know which one you are using?  There are techniques
>for relaying these signals out-of-band.

G.711 ulaw - which should be pretty much 'toll-quality' of course.

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"Jim" <me2@my.net> wrote in message
news:11thqf87qvl7m46@corp.supernews.com...
> Mark wrote: 
>
> Some VoIP codecs are very likely to distort DTMF signals. Do you know
> which one you are using?  There are techniques for relaying these signals
> out-of-band.

Unlikely to degradagation as the DTMF tones are all digitised.
Have you any speech quality issues? I.e. echo, silent seconds, etc...this
may be down to lost packets.
If so, what connection are you using? If the VoIP is breaking out the the
PSTN (which is 100% quality) your IP conection is to blame. If purely IP the
it could be numerous problems, suspect the internet!!

Stuart

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"Stuart" <stuartlegg@btinternet.com> wrote: 
>
>Unlikely to degradagation as the DTMF tones are all digitised.

Incorrect I'm afraid. If the original poster's equipment is using 'in-band' 
DTMF
and is not using G711 codec then the compression techniques will degrade or 
lose
entirely the DTMF information. If the poster is using G.711, but has selecte
d
ulaw then it still can suffer from conversion when it hits the UK's a-law ba
sed
PSTN.

If you are using a true VoIP handset or softphone, then I'd suggest trying t
o
configure your equipment to use an 'out of band' method such as RFC2833 or S
IP
INFO, although your provider has to support it.

If you are using a VoIP adapter and plugging in a normal PSTN phone, then ma
ke
sure you have inband DTMF selected and are using G.711 a-law (sometimes refe
red
to as PCMA in the menus).

Linus


--
Linus Surguy - Magrathea Telecommunications Ltd. Wholesale and retail teleph
one
services. www.magrathea-telecom.co.uk www.uknumber.co.uk www.callthrough.co.uk[/ur
l]...telesave.co.uk: UK 2.5p/1.5/1p  South Africa 6p US,France,Germany,Eire 2
.5p
Looking for VoIP ? We're the largest wholesale numbering supplier in the UK!

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"Linus Surguy" <linus@magrathea-telecom.co.uk> wrote in
message news:43dc95f1.1261470296@10.0.0.3

[snip]

> If you are using a VoIP adapter and plugging in a normal
> PSTN phone, then make sure you have inband DTMF selected
> and are using G.711 a-law (sometimes refered to as PCMA
> in the menus).

Doesn't work on my Sipura SPA-2000 on Sipgate. I have to use SIP INFO for
DTMF to be passed to menu systems at the other end. Using G711a BTW.

Ivor

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