[asterisk-users] ChanSpy in Asterisk 1.2.24

[Joao Gomes Pereira]

Hello
I have an old Asterisk where I need to listen to Agent calls. So I 
created this code:

exten => _555,1,ChanSpy(Agent)
exten => _555,n,Hangup()

But I always get:

2009-10-22 16:00:38 WARNING[5695]: pbx.c:1720 pbx_extension_helper: No 
application 'ChanSpy' for extension (default, 555, 1)

It seems that Asterisk doesn't have ChanSpy enabled... is this possible? 
Which Asterisk module do I have to enable?
Thanks
Regards
Joao Pereira

-- 
StarTel - A Rede Livre
Joao Gomes Pereira
www.startel.pt
+351 304500650
sip: gomespereira at startel.pt