On the Airbus A318/19/20/21. The following conditions must be met to erase:
The aircraft is on the ground, and the parking brake is on
Pressing the CVR ERASE push button for 2 seconds will then erase the tape.
The prelim from the NTSB says "The CVR recording began during final approach, and continued while the aircraft was at the gate."
screw "send to voice mail". I want the phone to *PICK UP*, play one of a selection of pre-recorded messages, and then allow the caller to press a button if they really really want to interrupt, or answer the question in the message. 200MHz on an ARM is plenty of power to implement this.
In every non-trivial program there is at least one bug.