[asterisk-connector]
Description     = MS SQL connection to 'asterisk' database
Driver          = /usr/lib64/libtdsodbc.so
Setup           = /usr/lib64/libtdsS.so
Servername      = SQL2
Port            = 1433
Username        = MyUsername
Password        = MyPassword
TDS_Version     = 7.0

[odbc-test]
Description = TDS connection
Driver = /usr/lib64/libtdsodbc.so
Setup = /usr/lib64/libtdsS.so
UsageCount = 1
FileUsage = 1

[asterisk-connector]
enabled => yes
dsn => asterisk-connector
username => MyUsername
password => MyPassword
pooling => no
limit =>
pre-connect => yes

[root@TestVM etc]# isql -v asterisk-connector MyUsername MyPassword
+---------------------------------------+
| Connected!                            |
|                                       |
| sql-statement                         |
| help [tablename]                      |
| quit                                  |
|                                       |
+---------------------------------------+
SQL>

[root@TestVM etc]# isql -v asterisk-connector
[S1000][unixODBC][FreeTDS][SQL Server]Unable to connect to data source
[01000][unixODBC][FreeTDS][SQL Server]Adaptive Server connection failed
[ISQL]ERROR: Could not SQLConnect

isql -v asterisk-connector