Bug number 1.
There is a bug in the upgrade for the enterprise plugin for oracle.
The sql for upgrade/8/oracle_enterprise.sql has invalid alter statements
ALTER TABLE entSipUser ADD COLUMN outboundproxy VARCHAR(255) NULL;
ALTER TABLE entSipUser ADD COLUMN promptCredentials INT NULL;
The COLUMN keyword is invalid here and should be removed.
I had to apply the sql updates manually for 8, 9 and 10.