[asterisk-users] Problem with Asterisk and SPA-3000

[Andrew Hakman]

The SPA-3000 is notorious for falsely detecting DTMF tones in regular
voice, and when it "thinks" it hears DTMF, it will produce a short
real DTMF tone that's only audible to the SIP side of the device, not
the PSTN side, or out of band SIP DTMF message (dependent on how you
have the device setup). I'm guessing you have your IVR setup so that a
single keypress triggers it, and the SPA-3000 thinks it hears that
key. I would suggest to not have any single key start your IVR, as the
SPA-3000 only ever seems to incorrectly detect and generate one DTMF
tone at a time (it never generates a sequence, just one random key's
worth of DTMF).

Hope this helps,
Andrew

On Wed, Dec 9, 2009 at 7:35 AM, Ivan Stepaniuk <ivan at albafotonica.com> wrote:
> Hello everybody,
>
> I have a very strange issue with a Linksys SPA-3000 (1 fxo + 1 fxs) used
> as PSTN gateway to asterisk in a small office. Everything works just
> fine, except that sometimes, and it seems that only for long incoming
> calls, the IVR menu appears on the middle of the call(like a three way
> call, call goes on with prompts playing over the parties). Dialing an
> extension at the prompt at that time actually works but disconnects the
> original extension (and transfers the PSTN leg to the new extension as
> normally).
>
> At the CLI there is nothing but a new incoming call from the SPA,
> exactly as the original call.
>
> It seems to happen with both asterisk 1.2 and 1.4, I am quite lost, Does
> anyone know what could be causing this problem?
>
>
> --
> Iván Stepaniuk
> Alba Fotónica S.L.
> www.albafotonica.com
>
>
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