[Asterisk-Users] Caller Id AGI Script

[Robert Boardman]

As you my be aware the X100p cannot collect uk caller id,
now I have a modem and a perl script that creates a 
file /etc/asterisk/callerid.txt on each incoming call in the format 

number,date,time,name

over writing each time a new call comes in

I can asterisk read this file and populate the callerid for internal phones and 
cdr?

I think it can be done with AGI but don't know where to start could someone 
point me in the right direction

Thanks in advance for your help

Robb