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
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