Can someone help me

i am doing a project on asterisk. i doing a trunking between asterisk and cisco callmanager4.0. however, i encounter some problem in the process.

i have problem connecting the callmanager to asterisk. i need help with this. Can anyone help me???

The following is extension.conf that i written:

[quote][ccm]
exten=>_656411XXXX,1,Dial(SIP/callmgr7@192.168.13.37,10)[/quote]

The following is sip.conf that i written:

[quote][callmgr7]
type=friend
context=ccm
host=192.168.13.37
disallow=all
allow=ulaw
allow=alaw
nat=no
canreinvite=yes
qualify=yes[/quote]
I have no idea where i went wrong. Pls… if anyone spot my mistake pls inform me asap. thank you very much. =)