[Freeswitch-dev] FXS bridged on FXO ports and DTMF - Deja Vu

Anthony Minessale anthony.minessale at gmail.com
Wed Jun 16 09:09:53 PDT 2010


openzap_pre_buffer_size is a variable you can set to specific number of MS
60 for example.
it will pre_buffer the audio on the channel so when you detect dtmf it will
completely drop the buffer so all of the original
dtmf should be dropped as well.  probably if the dtmf is too long then it
will cause problems anyway.

if that pre buffer does not fix anything it would point to echo or bleeding.

We could make a variable to disable dtmf detection completely on a per-call
basis possibly but you will still probably hear it bleeding.

This type of problem was reported fixed with sangoma because of the
echo canceler.
I don't use dahdi or digium stuff much so I can't comment on what happens
when you use it.



On Wed, Jun 16, 2010 at 3:41 AM, François Legal <devel at thom.fr.eu.org>wrote:

> Does this really fix it ?
> I wonder because the problem I see here is also that the FXS side detects
> the DTMF and then queues it on the FXO side for generation. That leads to
> the called party receiving twice the DTMF, the first one is the inband
> DTMF, the second is the one queued/generated by the FXO channel.
>
> For a clean fix, I guess some kind of application should be created, that
> would prevent DTMF to be queued on the other channel. Such application
> would then be called before the bridge. Maybe there is a cleaner way to do
> this.
>
> François
>
> On Tue, 15 Jun 2010 18:23:13 -0500, "Jeroen C. van Gelderen"
> <jeroeng at thegreek.com> wrote:
> > Hi everybody,
> >
> > I have a problem that is very similar to a problem
> > reported by François [1] except for the fact that
> > my FXS and FXO ports are on a Xorcom Astribank
> > device instead of a Sangoma.
> >
> > To quote François: "The problem is that each leg of
> > the bridge is detecting the inband DTMF, and so
> > [F]reeswitch sends each detected DTMF from one leg
> > to the other, and so on and so forth (as each leg
> > detects the DTMF again and again)"
> >
> > HIS words but evidenced by the MY log :)
> >
> > The snippet below has DTMF coming in on the FXS port
> > (1:1) and bouncing between it and the FXO port (3:1).
> > The ports are simply bridged together with
> >
> >   "bridge(OpenZap/3/1/F)" or "bridge(OpenZap/3/1/w)"
> >
> > I'm running:
> >
> > FreeSWITCH version: 1.0.head (git-01c0c69 2010-06-08 16-22-21 -0500)
> > dahdi: Version: SVN-trunk-r8762
> >
> > Output of lsdahdi at end of message.
> >
> > ----8<----8<----8<----8<----8<----8<----8<----
> > [...]
> > 2010-06-13 04:18:39.217256 [DEBUG] mod_openzap.c:721 queue DTMF [4]
> > 2010-06-13 04:18:39.256255 [DEBUG] zap_io.c:2062 3:1 GENERATE DTMF [4]
> > 2010-06-13 04:18:39.397253 [DEBUG] mod_openzap.c:721 queue DTMF [4]
> > 2010-06-13 04:18:39.439252 [DEBUG] mod_openzap.c:780 Dropping frame!
> (write
> > not ready)
> > 2010-06-13 04:18:39.439252 [DEBUG] zap_io.c:2062 1:1 GENERATE DTMF [4]
> > 2010-06-13 04:18:39.637249 [DEBUG] mod_openzap.c:721 queue DTMF [4]
> > 2010-06-13 04:18:39.676248 [DEBUG] zap_io.c:2062 3:1 GENERATE DTMF [4]
> > 2010-06-13 04:18:39.859244 [DEBUG] mod_openzap.c:780 Dropping frame!
> (write
> > not ready)
> > [...ad infinitum...]
> > ----8<----8<----8<----8<----8<----8<----8<----
> >
> > Because I needed DTMF pass-through working "now"
> > I applied an ugly HACK. This drops DTMF tones
> > detected on spans 3 and 4 (which are my FXO
> > spans). This is very WRONG but it does solve
> > my immediate problem:
> >
> > ----8<----8<----8<----8<----8<----8<----8<----
> > diff --git a/libs/openzap/mod_openzap/mod_openzap.c
> > b/libs/openzap/mod_openzap/mod_openzap.c
> > index 5aebfea..ff3b081 100644
> > --- a/libs/openzap/mod_openzap/mod_openzap.c
> > +++ b/libs/openzap/mod_openzap/mod_openzap.c
> > @@ -718,8 +718,12 @@ static switch_status_t
> > channel_read_frame(switch_core_session_t *session, switch
> >                 for (p = dtmf; p && *p; p++) {
> >                         if (is_dtmf(*p)) {
> >                                 _dtmf.digit = *p;
> > -                               zap_log(ZAP_LOG_DEBUG, "queue DTMF
> [%c]\n",
> > *p);
> > -                               switch_channel_queue_dtmf(channel,
> &_dtmf);
> > +                               if (tech_pvt->zchan->span_id == 3 ||
> > tech_pvt->zchan->span_id == 4) {
> > +                                       zap_log(ZAP_LOG_DEBUG, "Ignoring
> > DTMF [%c] on FXO port %d:%d\n", *p, tech_pvt->zchan->span_id,
> > tech_pvt->zchan->chan_id)
> > ;
> > +                               } else {
> > +                                       zap_log(ZAP_LOG_DEBUG, "queue
> DTMF
> > [%c]\n", *p);
> > +
> switch_channel_queue_dtmf(channel,
> > &_dtmf);
> > +                               }
> >                         }
> >                 }
> >         }
> > ----8<----8<----8<----8<----8<----8<----8<----
> >
> > Can someone point me in the "right" direction
> > instead? Do I need to do this at the OpenZAP/DAHDI
> > level by disabling some kind of DTMF detection
> > like was done for the Sangoma driver?
> >
> > Any and all pointers appreciated.
> >
> > Cheers,
> > -Slim
> >
> > [1] [Freeswitch-dev] FXS bridged on FXO ports and DTMF
> >
>
> http://www.mail-archive.com/freeswitch-dev@lists.freeswitch.org/msg02830.htm
> > l
> >
> > [Freeswitch-dev] Problem with sending
> > DTMF on FXS port bridged to   an FXO port
> >
> http://lists.freeswitch.org/pipermail/freeswitch-dev/2010-April/003607.html
> >
> >
> > ----8<----8<----8<----8<----8<----8<----8<----
> > [root at localhost freeswitch]# lsdahdi
> > ### Span  1: XBUS-00/XPD-00 "Xorcom XPD #00/00: FXS" (MASTER)
> >   1 FXS        FXOKS
> >   2 FXS        FXOKS
> >   3 FXS        FXOKS
> >   4 FXS        FXOKS
> >   5 FXS        FXOKS
> >   6 FXS        FXOKS
> >   7 FXS        FXOKS
> >   8 FXS        FXOKS
> >   9 Output     FXOKS
> >  10 Output     FXOKS
> >  11 Input      FXOKS
> >  12 Input      FXOKS
> >  13 Input      FXOKS
> >  14 Input      FXOKS
> > ### Span  2: XBUS-00/XPD-10 "Xorcom XPD #00/10: FXS"
> >  15 FXS        FXOKS
> >  16 FXS        FXOKS
> >  17 FXS        FXOKS
> >  18 FXS        FXOKS
> >  19 FXS        FXOKS
> >  20 FXS        FXOKS
> >  21 FXS        FXOKS
> >  22 FXS        FXOKS
> > ### Span  3: XBUS-00/XPD-20 "Xorcom XPD #00/20: FXO"
> >  23 FXO        FXSKS        RED
> >  24 FXO        FXSKS        RED
> >  25 FXO        FXSKS        RED
> >  26 FXO        FXSKS        RED
> >  27 FXO        FXSKS        RED
> >  28 FXO        FXSKS        RED
> >  29 FXO        FXSKS        RED
> >  30 FXO        FXSKS        RED
> > ### Span  4: XBUS-00/XPD-30 "Xorcom XPD #00/30: FXO"
> >  31 FXO        FXSKS        RED
> >  32 FXO        FXSKS        RED
> >  33 FXO        FXSKS        RED
> >  34 FXO        FXSKS        RED
> >  35 FXO        FXSKS        RED
> >  36 FXO        FXSKS        RED
> >  37 FXO        FXSKS        RED
> >  38 FXO        FXSKS        RED
> > ----8<----8<----8<----8<----8<----8<----8<----
> >
> >
> > Cheers,
> > -Slim
> > --
> > Jeroen C. "Slim" van Gelderen
> > Olympic Sports Data Services
> > Email: jeroeng at thegreek.com
> > Phone: +1 876 953 6182 x128
> >
> >
> >
> > _______________________________________________
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-- 
Anthony Minessale II

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