The tones should be correct, they were taken from BT many moons ago...
The CPC timers are all wrong in the OBIHAI UK XML, the correct values can be found here:
https://www.ukvoipforums.com/viewtopic.php?f=10&t=341&p=748&#p748EDIT: The original disconnect tone was: 400@30,400@30;2(*/0/1+2) however OBi's don't use the traditional format. It appears an extra zero was added from somewhere.
The correct value i believe should be 400-30;2Let me check with Mark if the OBi's use seconds or milliseconds with tone values, I'm sure it's seconds though.