[asterisk-users] Run script action when Dahdi phone goes off-hook?

[asterisk]

Hi,

Long story short - I have an ancient Britsh Telecom phone attached to my 
Asterisk PBX via Dahdi. It works beautifully, receiving calls, and the 
call quality is excellent. However, dialling out is impossible, as 
Asterisk consistently mis-reads the number of pulses the dial sends (it 
could be a squiffy dial, I'm not sure). Not to mention the fact that, in 
today's modern "want it now" age, waiting up to 3 seconds between digits 
whilst the rotary dial does its thing gets old very quickly...

As with all Dahdi connected phones, when I lift the handset, I 
immediately see:

  -- Starting simple switch on 'DAHDI/x-y'

Can I run a script (either in extensions.conf, or ael, or whatever) when 
that is detected? If so, I will create a small app which allows me to 
type a telephone number on my computer, I can then lift the phone & the 
script will go find the number I typed, and dial it for me.

Thanks in advance!
Ade.