Change the by default freetds drivers in linux

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http://stackoverflow.com – how to change or setup by default freetds driver in linux for Perl programming? odbcinst.ini [FreeTDS] Description = FreeTDS ODBC driver for MSSQL Driver = /usr/tdsver7/lib/libtdsodbc.so.0.0.0 Setup = /usr/lib/libtdsS.so.2 FileUsage = 1 odbc.ini [SQLSERVER] description = Asterisk ODBC for SQL SERVER driver = FreeTDS server =\APSHCL Trace = No Database = RTI port = 1433 tds_version = 9.0 language = us_english This is configuration file,i want the change the by default freetds driver or set the driver because this configuration is not working my program. please guide me. (HowTos)