Service tax on normal accounts writing serives

Can any one guide me whether service tax is applicable for the services rendered by normal accountants firm doing mostly accounts writing job for independent showrooms and companies?

mind you the its accounts writing company and not chartered accountants firm.

Till my knowledge there is service tax liability for CA but not clear for non CA firm.

Further, can the service of non CA firm are covered in Business auxiliary services?

kindly reply ASAP.

Thanks in advance