The insider trading case against former Goldman Sachs director Rajat Gupta hit another milestone this week when prosecutors filed an expanded indictment.

The new set of charges features an intriguing accusation--that Gupta called in to a Goldman Sachs board meeting in March 2007 from Rajaratnam’s offices at the Galleon Group hedge fund. The indictment says that he leaked material information just minutes after the call. Now that’s brazen.

A conspiracy theorist might wonder if the fund had the phones rigged such that calls could be compromised. But in hindsight, it does seem odd that the director would call in from a hedge fund. It just doesn’t seem secure enough. Gupta’s legal team denies the charges.

DealBook notes that, “The new charges seem to counter one of Mr. Gupta’s main lines of defense. At pretrial hearings, Mr. Gupta’s lawyers have said that the relationship between Mr. Gupta and Mr. Rajaratnam, once close friends and business associates, had soured by 2008.”

But the call-in from the Galleon offices took place allegedly in March 2007, suggesting that the men were still close associates. In any case, all this will get a robust airing beginning April 9, when the trial is scheduled to begin. At this point, there would appear to be little chance of a settlement; Gupta appears convinced that he is innocent. Whether that is mere self-delusion remains to be seen. This will be interesting.

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