[Asterisk-Users] Sipura SPA-3000 and PSTN dtmf

[Vladyslav]

Just my couple notes on spa3000 and PSTN DTMFs.
Such schema:
PSTN <-> SPA3000 <-> Asterisk

Have problems with DTMF detection on incoming calls
when call comes from cell phone. Once per 4 times it 
misdetect some ditigs (whether first digit will be 
doubled or unrecognized at all).
 Were tried different (5) cell phones (cell phones providers)
 Also support from sipura has no clue.

On Thu, 2006-03-02 at 09:36, Martin Joseph wrote:
> On Mar 1, 2006, at 3:03 PM, asterisk at anime.net wrote:
> 
> > On Wed, 1 Mar 2006, Arsen Chaloyan wrote:
> >>> The inbound PSTN DTMF works excellently, e.g. people
> >>> calling from PSTN
> >>> into the * box are able to pick IVR items with DTMF
> >>> reliably.
> >> exactly!
> >
> > There are some other problems with DTMF and spa3000. Sometimes the 
> > spa3000 mis-detects remote speaker's voice as DTMF and sends rfc2833 
> > events to asterisk.
> >
> > It's a well known problem: 
> > http://voxilla.com/PNphpBB2-viewtopic-t-1054.html
> >
> It's doesn't seem to be  spa3000 specific, as I have seen this same 
> behavior in two other FXO's...
> 
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