Hi *,
after further trial and error, I think I narrowed it down to the DSL filtering.
I have DSL and phone all on the same pair available at any phone outlet in my house and I have one filter for each phone.
This works well and BTW does not harm the DSL speed, but harms the OBi (and only the OBi!) caller ID detection.
I realized when I had a phone attached to one outlet with its filter, I had the OBi attached to another plug without any DSL filter and the caller ID was never recognized. Removing the filter from the phone outlet caused the caller ID to start working on the OBi attached to the other outlet. After that, I unplugged the phone, left the OBi attached without any DSL filter and tried 12 inbound calls in a row from number in white list with no problems.
Of course, I can't live with that because of the noticeable hiss and crackling without the DSL filter plugged. I tried to plug such a filter to the phone plug of the OBi, but with unsatisfactory results (hiss lowered but not eliminated).
Any suggestion, happily welcome.
Thanks