Below are the PSP games that use the microphone, either built-in or as part of an external headset, for voice chat with other players. Voice chat is possible in both Infrastructure and Ad hoc modes unless otherwise indicated.
SOCOM: U.S. Navy Seals series:
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Fireteam Bravo
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Fireteam Bravo 2
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Fireteam Bravo 3
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Tactical Strike
Syphon Filter series:
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Logan's Shadow
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Dark Mirror
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Killzone: Liberation (ad-hoc only)