DIDs CALLBACK IN A2BILLING

My DIDs callback was working perfectly before restore backup file to server. my server was hack in by someone and use my server to hack some other big company servers. So My china consultant have backup all file and advised to reformat and reload [login to view URL] consultant help me to restore allbackup file to server with asterisk & [login to view URL] is fine except my call back. DIDs incoming call are rejecting but no Callback happening but LegA is working fine, The problem is My China consultant is missing in action. Please help me provide the procedure of solving my callback issue.