[Asterisk-Users] GNUGK user

[pesb]

Hi there,
           I am new to asterisk. I have been using gnugk (Open Source H323 
Gatekeeper) for a while. Rigth now, I am needing an IVR system for my 
Gatekeeper. I have read some info on the gnugk mailling list pointing 
asterisk as an option.
Could anyone give me some info on how to do it? I have succesfully installed 
asterisk version 0.7.2 on my Mandrake 9.2
What I need is the following:
When a user of my VoIP network enters the network, he shoulds listen to a 
recording that asks for his PIN. After the correct PIN is dialed, he should 
listen to another recording asking for the called partie number. Finally, 
after that, the call should be routed to the correct GW.
My VoIP network consists of TNT's Gateways.

     thanks in advance,
                                  P. Salinas