Chanspy core dumping asterisk 1.2.5

I’m a young african engineer working in a callcenter and i use to read interesting posts from this list. I have encoutered some trouble using chanspy app.
While i’m spying on an agent in the callcenter where i work asterisk stops with a core dumping message.
I use the 1.2.5 version of asterisk on a proliant DL 380 g4 server with fedora core 3 and g729a codec bought from digium.
I hope you have already got this problem with chanspy and solve it.
Thank you in advance