I've only read it once, but I don't think 117 affects acknowledgement for long call assignments; only acknowledgements for required rest periods prior to a short call (ie, a short call that covers a long haul flight like ATL - JNB).

I think the company wants this new 2 hour acknowledgement of the rest periods for the rare cases it applies, but it seems it would have the effect of hamstringing long haul reserves on long call to a two hour contact window.

It seems to have the potential to significantly impact junior reserve pilots in categories with required rest periods prior to short call; especially those who commute to reserve.

I am very interested if anyone has a different take or better information.