[otrs] how get the escalate ticket mails to higher level automatically

Hi All, I am using otrs 2.4.5 on fedora11 how get the escalate ticket mails to manager automatically. for example : The ticket is escalated so immediately the mail to higher level like if L-1unable to resolve the issue it need's to escalate L-2, if L-2 unable to resolve escalate to L-3. If any one give the solution for this : How to set the escalation mails. Regards, Ramana