odbc.ini
[ODBC Data Sources]
VOIP
[VOIP]
Driver = FreeTDS
Description = Connection to the new voip DB
Trace = No
Server = 127.0.0.1
Port = 4433
Database = databasename
[Default]
Driver = FreeTDS

freetds.conf
[VOIP]
host = 127.0.0.1
instance = CRSSQL
port = 4433
client charset = UTF-8
tds version = 8.0

odbcinst.ini
[FreeTDS]
Description = FreeTDS Driver
Driver = /usr/local/lib/libtdsodbc.so
Setup = /usr/lib/odbc/libtdsS.so