Service Tax Credit

We are utilizing the Cenvat Credit at the time of service tax payment but i have doubt in Cenvat Credits, Which credits can be utilized? Commonly capital goods Cenvat Credit utilized but in my organization we are taken the expenses of Telephone, Courier, Professional Fees, Consultancy Charges, Traveling Charges, etc., this are eligible for Cenvat Credit? Please advice me for correct payment of Service Tax.