"Previous" does not work either.

Is Return To AA set to YES under AA/GRTG?: Yes it is

Tag on Call pilot says; Callpilot Mini NTAB9825


KSU version:
Tags say;
Norstar Plus NT7B53 FA-93


A bit of possibly unrelated info; repeat is set to 1 in greeting table. I would expect that whenever this is pressed the announcement should start over again. Instead there is silence for a bit then announcement of "exiting the system".

MICS DR7.0 FC
NT7B66DC Rel 01 0005