BT OR apparently also express surprise that ECI modems have been supplied to customers on Huawei DSLAM's.
We discussed this the other week and it would appear that the lefthand doesnt know what the right hand is doing
The contractors have only been supplying ECI's for at least 18 months. I know because I specifically wanted a Huawei, but the contractor told me he only had ECI's. (They are white sticky labelled on the outside of the box )
Black Sheep said moons ago that BT had decided that it didnt make any difference which modem was used with what dslam and said it didnt matter. There was an official announcement which may be still knocking around if you search. BS also confirmed recently that their supplies only had ECIs.
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btw.. out of interest I just dug out my ECI and I notice there it has a warranty - expiry date 06/2018. 5yrs warranty is a heck of a time, but doubt it would cover software.