asterisk users - May 2007 - Req-Installation process for app_dtmftotext.c

Hi,
I was looking for a way to pass alphanumeric variables to asterisk via
the keypad, found this application app_dtmftotext.c , And I already tried 
with 'spandsp' application for this. But I am getting errors.[I followed
the
instructions at http://www.soft-switch.org/installing-spandsp.html]
specifically by running this command:patch <apps_makefile.patch

I need clarification on 'ld.so.conf' file.[It has to be in the /etc/ 
directory. If you do not have such file - make one. In the file you need to 
add the path to the spandsp library.] Please give me the steps for this 
step.

I installed asterisk 1.2.17 only, i not installed any libpri or zaptel 
sources.

Can anybody be of help Me on this getting DTMFToText() application on 
asterisk with the help of app_dtmftotext.c and/or spandsp application is 
appreciated.

Regards
K.Rajesh.

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