[Asterisk-Users] SPA-3000 is translating vocal sounds into DTMF

[Rich Adamson]

> I am having the same problem with a male voice at the other end.
> 
> It is making the spa3k problem for me.
> 
> Has this been reported to SIPURA ?
> Is this a common problem ?
> has anyone done been able to make this happen less often ?
> 
> 
>         I would hope perhaps there's some kind of setting that has to do with
>         the way it detects inband DTMF?  I'm pretty sure it's an artifact of
>         this particular ATA; my other SIP devices are just fine.
> 
>      
>      
>     FWIW, I have the same prob on my spa3k. It's peircing and pisses my 
>     wife off greatly.
>      

Its a fairly common problem with the spa3k, but is somewhat dependent on
how it is configured and the distance to your CO.

If the spa3k is configured for ring thru (from the fxo to fxs without passing
through asterisk), the call remains within the spa3k. Its echo cancellation
and tone detection functions are not as good as they could be, and it seems
to have more problems with longer length pstn lines then it does with
shorter lines (eg, distance between the Central Office and the spa3k).

Reducing the audio levels on the pstn/fxo port seems to help somewhat, but
you'll reach a point where the audio is rather low when the issues have
been minimized. (In other words, the spa3k does not seem to have a very
good dynamic range.)

Seems the v3.1.7g firmware is worse then some of their earlier releases.

Linksys/Sipura support typically suggests very elementary things like check
to ensure the impedence is set correctly for your telco line (etc), and
then something like try v3.1.5 if you still have problems. I'd love to
escalate the issue to level 2 support (assuming that even exists).