[Asterisk-Users] DTMF Talk off

[John Millican]

Doug,
thanks for the help.  I am using uLAW  and inband every where. I have tried
using 2833 and it did not appear to make any difference, better or worse.
this is why I was thinking that if I could increase the minimum required time
for a tone that it night help, I am just not sure where the best place top do
this is.  i thought I had seen a post about setting relaxdtmf to a value to
actually make dtmf detection stricter but i can not seam to find anything
other than 'yes' or 'no'.
John

Doug Crompton wrote:
> John,
>
>  Well I am certainly not an expert on this. I am using an SPA-3000 and I
> have not experienced this. I did have to go to inband on the fxo channel
> as rfc8322 did not work for ivr's when using Asterisk. I think you said
> you were using a linksys or sipura product for you fxo?? If that is the
> case using inband and the ulaw/alaw encoder for the fxo channel might
> help. Worth a try I guess. There are some rfc8322 issues that apparently
> will be addressed with a rewrite in the next makor version release.
>
> Doug
>
> On Mon, 19 Jun 2006, John Millican wrote:
> > Doug, I read that post and unfortunately it was not a solution.  I do not
> > believe it has to do with interstate as it happens intra state also.  Is
> > there any way to make DTMF detection stricter, ie require a longer
> > minimum tone length.  Assuming ( yes a dangerous practice) that the human
> > voice will not hold a DTMF sequence stable for very long, if I lengthen
> > the minimum required length I may be able to minimize the talk off.  What
> > do you think? Any suggestions?
> > John M
> >
> > Doug Crompton wrote:
> > > Check....
> > >
> > >
> > > http://lists.digium.com/pipermail/asterisk-users/2005-January/078141.ht
> > >ml
> > >
> > > On Sun, 18 Jun 2006, John Millican wrote:
> > > > Hello all,
> > > > I have seen some chatter again about DTMF.  I see most of the talk
> > > > about DTMF around not being able to get an external IVR to recognize
> > > > digits, not a big issue for me at this time but sill interesting.  My
> > > > issue though, is with talk off on a zap channel.  It seems to be
> > > > getting worse or maybe my patience is thinning.  All my calls go out
> > > > and come in pstn through an FXO as I do not have high speed available
> > > > here at home.  My Current setup is:
> > > >
> > > > Phone-->PAP2--> * --->PSTN--->Voip number to * at another
> > > > location(that has high speed)--->send to VoIP provider
> > > >
> > > > I read a post about talked about the length of the DTMFish sound.  I
> > > > also remeber seing something about relaxdtmf being set to something
> > > > other than yes or no, so I looked in chan_zap.c and found  relaxdtmf
> > > > in many places but it looked to my inexperienced eye that it could
> > > > only be set to 'yes' or 'no', but i did find some mention of
> > > > tonlength (at line 10858) followed that to zaptel.c (line 3357) where
> > > > it said :
> > > > if ((tdp.dtmf_tonelen > 4000 ) || (tdp.dtmf_tonelen < 10 ))
> > > >     return -EINVAL
> > > > Which I am guessing means unless the dtmf is between these 2 values
> > > > ignore it. Any ideas what might happen if i increased the minimum
> > > > time value? if this is indeed what this is referring to?
> > > >
> > > >
> > > > Zapata.conf:
> > > > [channels]
> > > > callwaiting=yes
> > > > callwaitingcallerid=yes
> > > > threewaycalling=yes
> > > > transfer=yes
> > > > cancallforward=yes
> > > > busydetect=yes
> > > > busycount=6
> > > > echocancel=128
> > > > echocancelwhenbridged=yes
> > > > echotraining=yes
> > > > rxgain=0
> > > > txgain=0
> > > > immediate=no
> > > > context=default
> > > > signalling=fxs_ks
> > > > channel => 1
> > > > <same for channel 2>
> > > >
> > > > zaptel.conf:
> > > > loadzone = us
> > > > fxsks=1
> > > > fxsks=2

> > > >
> > > > extensions.conf:
> > > > exten => s,1,  NoOp(${CALLERID} time ${DATETIME});
> > > > exten => s,2,  Dial(sip/677&sip/666,30,tT);
> > > > exten => <a bunch of stuff to do with agi look ups and voicemail
> > > > leave/retrieve>
> > > >
> > > > All very basic and works like a charm except for the talk off.
> > > > Thanks in advance to all,
> > > > John M
>
> "Those that sacrifice essential liberty to obtain a little temporary safety
>  deserve neither liberty nor safety."  -- Ben Franklin (1759)
>
> ****************************
> *  Doug Crompton	   *
> *  Richboro, PA 18954	   *
> *  215-431-6307		   *
> *		  	   *
> * doug at crompton.com        *
> * http://www.crompton.com  *
> ****************************