Okay, a few facts on those missile systems
No matter whether it was the Ukrainian, so called rebels or the Russian armed forces, the operator behind the screen would have clearly seen the speed, altitude and track of the aircraft.
If it was military then it would have been squawking a code from its IFF transponder to say who it was.
If it is a civilian aircraft then I believe it would have been squawking its CAA identification code.
These systems are designed to work as a part of a laired system.
Long, medium (which this missile was) and short range.
Of course the system can work independently if needed.
From what I remember, these systems have basically 3 modes.
1/. Full auto where the missile interrogates the targets IFF and if it doesn't like the answer it gets then it launches.
2/. Semi auto which is the same as auto BUT the final launch decision is by the human operator.
3/. Manual where the aircraft is individually targeted and fired upon
Highly convenient that the Ukrainians have just released a so called intercepted message by the rebels saying that they thought it was a An26 aircraft.
Well i'll bet every penny i've got that a turboprop transport aircraft cruising at 32000 ft at 250 knots ish looks a hell of a lot different to a Boing 777 cruising at 400 - 450 knots so all this talk of a accident is crap imo.
As far as i'm concerned, it was a deliberate act of murder
According to the reports, the aircraft flew on largely intact before breaking up on impact.
To me, that says the missile hit on the front quarter of the aircraft killing the crew instantly hence no message from the crew
I think the only question outstanding is WHO did it, not why or how