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My answer was about to mirror YTF. 'Course if you refuse to speak, when the dealer says "100" and an opponent puts in 100 and the dealer quickly sweeps 'em all into the pot, you're going to be left looking pretty foolish as you sputter "but but but...it was 110". And if you wait until the player says "call" and then say "it's 110" you're proving you knew the dealer miscalled the amount of the wager and you're leaving yourself somewhat at the mercy of the dealer and floor to decide the fate of the wager. I don't really see that much of an upside to remaining completely mute.

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As noted above the dealer should not be calling out the bet. After he is asked (or decides to just blurt it out) if he says the wrong amount you have an obligation to immediately speak up. If he says the wrong amount, but it is close to what you have out there there is a good chance that will become the bet amount if the let the world pass you by.