"SFI2 is a broadband support product that tests to voice standards."
Certainly the BTWholesale Knowledge Based Diagnostics test will check most of what you've listed there. I believe they pick up something like 90% of faults for ADSL and over 95% for FTTC (this is probably higher now as tests have improved).
Most ISPs book a SFI visit when the KBD tests come back showing no fault detected. It's therefore, in most cases, a performance issue rather than a specifically clear fault.
I don't think the issue is as such Openreach and SFI, but more BT Wholesale and they way they handle performance issues or faults that they've been unable to identify with their KBD.
Edit: I should add here that you some very experienced and knowledgable support staff working at niche ISPs (like AAISP) who quite frankly, know a lot more than their support contacts within BT Wholesale. I suspect quite a lot of the BT Wholesale front line support staff have limited ISP and carrier level network training and understanding. This clearly creates an issue when an ISP has definitive evidence of a network fault (and its location) and at the same time the BT Wholesale Support staff member is unable to understand or input that fault into the system.
If you look at RevK's latest post http://www.revk.uk/2017/01/teaching-us-to-suck-eggs-...
this shows a classic example of this. There will be some very experienced and knowledgeable within Openreach that AAISP could work with to resolve this, but the problem is the system and protocol from BT Wholesale does not allow this.
Edited by AndyHCZ (Tue 17-Jan-17 12:29:02)