Tested configurations and recommended settings for using external databases.
InterBase InterBase WI-06.0.1.6 IBPhoenix Inc 2.00.00.142 'Character Set' — the same as the database character set.
Firebird Firebird-2.0.3.12981-1 IBPhoenix Inc 2.00.00.142 'Character Set' — the same as the database character set.