[otrs] make the customer Phone information required

I've successfully added the Phone information to the database (mysql) and updated the CustomerCreateAccount.dtl to show the field, but doesn't appear to be required for them to create an account. Do you know how I can make this required to create an account? Thanks for your time. ********************************* Jake Covert Infrastructure Analyst Electronic Data Systems PSIC Support Group (586) 986-9698 Work (586) 518-3859 Pager http://www.eds.com *********************************