[Asterisk-Users] Asterisk 1.2.7.1 DTMF anomaly

[Vahan Yerkanian]

This is a known issue with Asterisk's implementation of DTMF detection. 
There are two bug reports open up on bug tracker. Currently the best 
combination is to set DTMF TX method on Spa3k to INFO and auto on 
asterisk side. Works 95%, skips digits if you press buttons on the FXO 
end too fast. Until the DTMF stuff gets rewritten in Asterisk this gonna 
be this way, so far 2 years still no 100% dtmf detection, both detection 
and transmit parts are flawed and dont work 100%, even inband. Affected 
fxo gateways are (tested by myself): Sipura, Addpac, Planet, Wellgate.

HTH,
Vahan

Dave Fullerton wrote:
> 
> Greetings,
> 
> I'm using asterisk to connect our three locations together with a sort 
> of inter-company auto attendant connected like this:
> 
> PBX (fxs) <-> Sipura 3k (fxo) <-> Asterisk <-IAX-> remote asterisk
> 
> It works like this: Person picks up their phone and dials a number to 
> get to the auto attendant (I don't have any FXO ports available on our 
> PBX to do it the "right" way). The attendant answers and asks them the 
> remote extension they want to dial. This setup has worked very well for 
> several months. Last week I upgraded to 1.2.7.1 from 1.2.4 (I think). 
> Since then I've been having trouble with the auto-attendant correctly 
> detecting DTMF (missing digits). Some times it works flawlessly, others 
> I have to try over and over before it is detected correctly. It isn't 
> even consistently dropping the same digit from what I can see on the 
> console. The only thing I've found is that I have a better chance of it 
> working if I wait for the prompt to finish before dialing. I have 
> changed the DTMF method from rfc2833 to info and finally inband with 
> only a little change (inband seems to work the best).
> 
> Has anyone else run into similar problems or have any more suggestions 
> to try?
> 
> This is the attendant portion of my extensions.conf:
> 
> [inter-attendant]
> exten => s,1,Answer
> exten => s,2,Wait(1)
> exten => s,3,Set(TIMEOUT(response)=10)
> exten => s,4,Background(enter-ext-of-person)
> 
> exten => i,1,Playback(invalid)
> exten => i,2,Goto(s,4)
> exten => i,3,Hangup
> 
> exten => t,1,Playback(goodbye)
> exten => t,2,Hangup
> 
> include => tests
> include => fullertonpbx
> include => intercompany
> 
> 
> 
> Thank you for any insight you can provide.
> 
> Dave Fullerton
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
> 
> Asterisk-Users mailing list
> To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>