How Do I Get My Teammates’ Voices To Come Out Of My Tv Speakers In Halo 3 On Xbox Live?

This feature was working fine when I first logged on to Xbox Live but now, all of the sudden, it stopped working. I didn’t mess with any of the settings. I want to be able to hear my teammates’ voices over my tv speakers AND in my headset. I want to do this during Versus gameplay and during Cooperative gameplay. Can anyone help?

Tagged as: Come, halo, live, Speakers, Teammates', Voices, XBOX