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I'm getting mixed feeling about this. In this list of supported phones it's not listed, however when you go to Add a phone (I'm on V15.5) it's there in the list under the heading "End of Life" which, to me, suggests it is compatible, at least to some degree:

I have read the How to configure Aastra 67i Series for 3CX article which has a link to firmware for the Aastra 675i, but no mention of the 51i. So first question, does anyone know if Firmware versoin 2.6.0.2019 is ok for the 51i?
Incidentally I have also followed this article on how to provision Aastra phones but it didn't work - not necessarily surprising if I need Firmware version 2.6.0.2019 though
I have read the How to configure Aastra 67i Series for 3CX article which has a link to firmware for the Aastra 675i, but no mention of the 51i. So first question, does anyone know if Firmware versoin 2.6.0.2019 is ok for the 51i?
Incidentally I have also followed this article on how to provision Aastra phones but it didn't work - not necessarily surprising if I need Firmware version 2.6.0.2019 though