Briefly

Comverse Technology Inc. received a subpoena from the U.S. attorney’s office after the maker of voice-mail software discovered errors in stock-option accounting and three top executives had resigned.

The May 2 request relates to grants dating to 1995, Comverse said Thursday in a Securities and Exchange Commission filing. The subpoena was issued a day after Chief Executive Kobi Alexander resigned along with the chief financial officer and general counsel.

Comverse in April said it would restate earnings back to at least fiscal 2001 after a committee of outside directors found that dates of stock-option grants may have been inaccurate.