Hi Dave,
I appreciate your quick and correct answer. I truly understand your position and rules that you apply, but isn't it more logic(and correct as well):
In case of radio comm/failure,
1. maintain last assigned level by ATC,
2. Climb to minimum sector altitude or any other minimum level applicable to current position of a/c
3. Comply with ICAO annex 2( as you mentioned) i.e. climb in accordance with your requested level.
it gives us an additional protection because we will be sure when a/c will start to climb/descent.(more applicable in radar environment)
From my point of view use "in ten minutes" phrase is not so strict or safe like standard ICAO procedures.
And why tower ATCOs "forced" to give level, that originally is under ACC jurisdiction?
Again,It sounds to me more risky than usual job requires.
Thanks for correct answers. Really, we have a lot of discussion in that direction.