[asterisk-users] How to send DTMF down a channel

Sat Sep 16 17:06:53 MST 2006

Hi, Actually I have several AGI scripts, manager "Originates" and Call
files doing different stuff applying the same procedure, thats why I
asked about console messages. It seems very weird to me.

Regards

On 9/16/06, Frank Church <voipfc at googlemail.com> wrote:
> I followed my intuition and sent a DTMF tone via the D() option in the
> dial command to the destination and that causes the voice to be
> transmitted after the call is answered.
>
> I also realised that the ringing tone to the destination does not come
> up until I execute a SendDTMF command before dialling the destination.
>
> >From that it appears that a command to issue a tone either before
> dialling out or after the call is picked up is necessary for the
> exchange of sound to take place, and I don't know whether that is a
> bug, or a feature of the Asterisk design.
>
> In verbose mode the call is interspersed with the output from the
> complicated AGI script and that will make things difficult, I have the
> problem (hopefully) solved now, but I will try to make the time to
> send you the output of the script after I remove the AGI code from it.
>
> In dial plan terms the idea is to generate a call file that contains
> both the caller id of the caller and the destination, and when the
> caller answers the call is routed to an AGI that extracts the dialled
> number and dials it as though they were entered via DTMF. And it
> appears that because no sound stream is generated through entry of
> DTMF, no sound is transferred after the call is answered. Perhaps
> trying something like that in a dial plan you create yourself will
> reproduce the problem.
>
> Thanks
>
> Frank
>
> On 9/15/06, Moises Silva <moises.silva at gmail.com> wrote:
> > could you post the output of the asterisk console in verbose mode?
> >
> > In logger.conf
> >
> > [logfiles]
> > console => notice,warning,error,verbose,debug
> >
> > Regards
> >
> > On 9/15/06, Frank Church <voipfc at googlemail.com> wrote:
> > > The program in question is an adaptation an AGI calling card program.
> > > It is adapted for callback by setting by channelling the callback call
> > > into the context used for the normal inbound leg.
> > >
> > > When used that way entering the PIN and destination number via DTMF
> > > works normally.
> > >
> > > I tried to implement sms/web callback simply by passing the
> > > destination number and the callerid in call file's parameters, so that
> > > the script can go straight to dialling the destination number without
> > > prompting the caller for it.
> > >
> > > This method results in dead air when the call is answered at the
> > > destination and it seems that the absence of DTMF tones for generating
> > > the call is the cause.
> > >
> > > Logically it should work, why the call should result in dead air
> > > because the destination number was not obtained through DTMF is what I
> > > can't understand.
> > >
> > > It appears that the absence of DTMF stops the RTP from being
> > > established to the destination number  or prevents the calls from
> > > being joined. When I dial back to the calling  number I get the busy
> > > voice prompt okay.
> > >
> > > Injecting the DTMF tones on the call channel is a really a kludge to
> > > simulate actual key presses in the hope that the dead air problem will
> > > go away and it .
> > >
> > > On 9/15/06, Moises Silva <moises.silva at gmail.com> wrote:
> > > > Frank. PlayDTMF and SendDTMF is the same as pressing keys at the
> > > > phone. Im not understanding well, can you please explain a practical
> > > > scenario of how do you expect it to work, and how actually works? :)
> > > > Thanks
> > > >
> > > > Regards
> > > >
> > > > On 9/14/06, Frank Church <voipfc at googlemail.com> wrote:
> > > > > How do you specify the channel the SendDTMF is sent on, as it has to
> > > > > be variable? I am able to use PlayDTMF  to send tones using the
> > > > > manager interface - the tones come up okay but it doesn't work.
> > > > >
> > > > > My problem comes from a working callback script that I am trying to
> > > > > adapt to web/SMS callback.
> > > > >
> > > > > The script is unchanged only that in the web/sms callback the
> > > > > destination number is passed in the call file variables to allow it be
> > > > > dialled after the callback is answered rather than being obtained via
> > > > > DTMF.
> > > > >
> > > > > The destination call is made alright, but the called party only gets
> > > > > dead air after the call is answered. It seems that the fact of
> > > > > pressing the DTMF keys activates the sound channel in way that the
> > > > > direct call back does not, which is why I am going through all these
> > > > > hoops. I just hoped that sending some DTMF tones programmatically
> > > > > would simulate the actual key presses.
> > > > >
> > > > > Do you have any ideas of what the problem might be?
> > > > >
> > > > >
> > > > >
> > > > > On 9/14/06, Moises Silva <moises.silva at gmail.com> wrote:
> > > > > > http://www.voip-info.org/wiki-Asterisk+cmd+SendDTMF
> > > > > >
> > > > > > Regards
> > > > > >
> > > > > > On 9/14/06, Frank Church <voipfc at googlemail.com> wrote:
> > > > > > > How can DTMF  be sent down a channel?
> > > > > > >
> > > > > > > I am thinking of method where say a channel id can be grabbed from
> > > > > > > Asterisk Manager events and a DTMF signal sent down that channel,
> > > > > > > through AGI, Asterisk Manager Interface or whatever?
> > > > > > >
> > > > > > > Is it possible to have a command in extensions.conf which can take
> > > > > > > both the channel and the dtmf numbers as parameters and send the DTMF
> > > > > > > signals?
> > > > > > >
> > > > > > > Frank Church
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