It can. I use it like:

   session:execute("bind_meta_app", "1 b s execute_extension::dx XML features");

   session:execute("bind_meta_app", "2 b s record_session::/usr/local/freeswitch/recordings/${caller_id_number}.${strftime(%Y-%m-%d-%H-%M-%S)}.wav");

   session:execute("bind_meta_app", "3 b s execute_extension::cf XML features");

From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Nik Middleton
Sent: Monday, December 07, 2009 2:59 PM
To: freeswitch-users@lists.freeswitch.org
Subject: Re: [Freeswitch-users] Trapping dtmf on bridged call

Can this be done in an lua script?

Regards,

---

From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Michael Collins
Sent: 07 December 2009 22:18
To: freeswitch-users@lists.freeswitch.org
Subject: Re: [Freeswitch-users] Trapping dtmf on bridged call

On Mon, Dec 7, 2009 at 2:02 PM, Nik Middleton <nik.middleton@noblesolutions.co.uk> wrote:

Hi

Is it possible to trap on DTMF on a bridged call within an LUA script?  I’ve tried setting the gateway to use inband, but no joy.  It looks like I could use start_dtmf, but I can’t see how to launch this within LUA

Perhaps you could use bind-meta-app to bind a key combo like *1 to whatever you want to have happen. Check it out:
http://wiki.freeswitch.org/wiki/Misc._Dialplan_Tools_bind_meta_app

The Local_Extension in the default.xml dialplan file has a few examples of using this tool.
-MC