confbridge conferences are supported on 2.25beta, I do not remember if the feature was added in 2.24.
however, ami events in confbridge are still insufficient, so functionality is a little less than using meetme (no reliability on mute/unmute state).
There is no particular example, it is configured exactly the same for meetme as for confbridge
[CONFERENCE/xxxx]
type=conference
label=some name
extension=xxxc
context=yyyy
Best regards,
