For the Line Port, set RingDelay to 6000 (once it's working, you can experiment with lower values).
It that does not help, also try the various options for CallerIDDetectMethod.
If no luck, please post what your Line port is connected to (Freebox, Livebox, France Telecom fixed line, etc.)
Also, confirm that when the OBi is powered off (Line port passed through to phone), caller ID is correctly displayed.