Information on the BASH Script to convert callsigns to .gsm audio files
so your your node speaks the callsign of the node you are connecting to
instead of just the node number.

This is how I installed the script.

Log into your Pi

cd /etc/asterisk/local
mkdir scripts
cd /etc/asterisk/local/scripts
wget http://www.qsl.net/w/w2ymm//downloads/ALLSTAR/Scripts/write_node_callsigns/write_node_callsigns.tar.gz

extract the files
  tar -xvzf write_node_callsigns.tar.gz

to run the script type
./write_node_callsigns

You may need to do this twice.

it will now convert the callsigns to audio files and save them in
/var/lib/asterisk/sounds/rpt/nodenames

----------Original doc of how I installed------------
Downloaded the script
    write_node_callsigns.tar.gz  onto my Windows PC.

Using WinSCP I made a new directory called /scripts in 
 /etc/asterisk
then I opened     /etc/asterisk/scripts

Move the zipped file into that directory
Now using Putty I switched to that directory

cd /etc/asterisk/scripts

unzip the file

Run the script by typing      
./write_node_callsigns

You should now see a whole bunch of text flying my on the screen as 
it is now converting all the callsigns
 in /var/log/asterisk/astdb.txt
into .gsm audio files.

the .gsm files will be be stored in
 /var/lib/asterisk/sounds/rpt/nodemames