Sorry, there is no way to revert back to SP1. I would like to point out that voice burge-in is not supported only during the AA greetings. Voice is still supported only after the AA greetings completes. However, DTMF burge-in is still supported in SP2. Callers can still burge-in by dialing the intended extension at any time during the AA greetings. As I said, callers have to wait for the AA to finish before they can use the voice command.