Issue with incoming call from Tollfreeforwarding DID


I installed asterisk 1.8 with vicidial on centos 5.8 and i am not able to receive incoming calls
i configure net4india outbound minutes and its working fine

I created inbound group and DID number
and in tollfreeforwarding i have forwarded all the calls from the XXXXXXXXX (tollfree No.) to 1234512345@my-static-ip-address

how do i configure sip.conf and extension.conf to receive calls from my DID

Please anyone give me a solution i tried everything from the internet but nothing worked

Please provide the diagnostics, and the configuration you used, from your most successful attempt to date.

At the moment, your request is so nebulous that it can only really be answered by telling you to read the documentation