[Asterisk-Users] Limit DTMF tones

[dean collins]

Hi Flynn,
Feel free to contact me offline if you feel this isn't suitable
conversation for online but I read an article about this a few weeks ago
about how you were freezing out other carriers for offering cheaper
calls to inmates than the inflated prices you charged. And I don't
understand how you are legally allowed to do this.

It must be profit driven because surely I could call one of my approved
numbers eg sister and then have her pass along the information to a
third party. 

Surely if you were looking to solve this 'isolation' issue and were
serious about it you would be tackling this problem another way.


Cheers,
Dean


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Flynn
Sent: Thursday, November 04, 2004 1:52 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: RE: [Asterisk-Users] Limit DTMF tones

On 11/4/2004, "Henry Devito" <hdevito at qwest.net> wrote:

>The issue is the inmates have figured out a way to dial long distance
>numbers by calling different private phone numbers and using that
companies
>DISA to complete calls. So in order to stop that I have to suppress
dtmf
>after so many digits are dialed.  Any idea's?
>

My, prisoners are getting devious :)

Anyways, you'd only be able to do this by hacking the code, as others
have pointed out. What you want is in res_features.c (if I understand
the code correctly), in the function called "ast_bridge_call". On *
release 1.0.1 it's somewhere on line 520:

            if (f && (f->frametype == AST_FRAME_DTMF)) {
                  if (who == peer)
                        ast_write(chan, f);
                  else
                        ast_write(peer, f);
            }

So you'd have to hack it by disabling commenting out that section. I
think this bit of code is only executed once the two legs of the call
are bridged, so it probably wouldn't affect anything else.

I also think that if you were at some point required to be able to send
DTMF after the initial dial pattern, you could programmatically via the
dialplan use the "D" option in the Dial application to send dtmf
digits.

Hope you do test this out before putting it live ;) Free advice, so
don't knock me out if it breaks something else!!

Flynn
_______________________________________________
Asterisk-Users mailing list
Asterisk-Users at lists.digium.com
http://lists.digium.com/mailman/listinfo/asterisk-users
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users