Hi azrobert and first, thanks for taking some of your time on reading and replying to my thread ;-)
Try: 2.25(.25+2);60(2+3.5)
I just tried this and I get the same result, when receiving a call, the number shows on the display and the line hangs...
What I think is hapenning is that the OBI does not like/bugs when there's such a pattern with 2 cadence durations.
The PAPT2 must be able to deal with it.
From what I understand/have read (I'm not a VOIP/Telecom expert) it's during the "short ring" that the CallerID is transmitted in France.
Data Transmission After Alert but Before Actual First Ring
If you have any other idea, let me know, I'll continue to dig/test on my side also.