[Freeswitch-users] key tone trigger event during call

[Michael Collins]

On Fri, Dec 5, 2008 at 8:32 AM, Frank @ Impact <frank at impactfax.com> wrote:
> Looks like tone detect might do it.  But..
>
> If so, What frequency would we use for particular keys?
>

http://en.wikipedia.org/wiki/DTMF#Keypad


> Will tone_Detect sniff both legs or would we just do both r and w on the
> called leg?
>

Just do both r and w.

> Can the tone_Detect timeout just be a very large number or can we leave
> out the timeout value so there is no timeout?

I know you can set it to a large number; I've never tried a "forever"
tone_detect. I'll check it out.

>
> Could the trigger from tone Detect do a gentone for a certain key?
>

I don't believe so. This is where the bind_meta_app functionality is
more applicable. The dialplan isn't really the best place to handle
"events" like this. (Event socket would be better if you can swing
that, but I think maybe a workaround is doable with just the dialplan
and some creativity.)

> Not much on the wiki on the mod.

My bad. I'm working on it. :) In the meantime grab those dtmf
frequency values and set up a test extension in your dialplan. Put a
tone_detect app in that test ext. (You could have the ext set tone
detect, sleep 10 seconds, do info app then hangup.) Then call the test
extension, press a few keys, then wait for the info app to dump. If
you have the tone_detect set a chan variable when a dtmf is pressed
then you'll see it in your info app dump. BTW, MikeJ reminded me about
the start_dtmf/stop_dtmf apps:
http://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_start_dtmf

Those might be necessary if your dtmf's are not already in-band.

Here's a sample extension you could try for testing, dialing 9990:

<extension name="dtmf_detect_test">
    <condition field="destination_number" expression="^9990$">
        <action application="answer"/>
        <action application="tone_detect" data="DTMF1 697,1209 rw
+10000 set DTMF1=true"/>  <!-- detect DTMF 1 key-->
        <action application="sleep" data="10000"/>
        <action application="info"/>
        <action application="hangup"/>
    </condition>
</extension>

Give that a try and at least see if you can detect the tones...
-MC