What's the meaning of Fornell's phone call to Gibbs?

At the end of the episode, Gibbs' phone rang and Parnell's name came up on the display. What does it mean?

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NCIS Quotes

Bishop: Seriously? How'd you get that?
Tony: Well, it's like Gorillas in the Midst. You'll get to understand his grunts.

Torres: When I break out the glass, maybe I can rip out the bars.
Bishop: With what? Your superhuman strength?

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