Halo 3 odst campaign voices?

[Ebay freak2014]

Ok, I just beat the campaign on Halo 3 odst, it is awesome! But what I dont get, is that lady's voice while playing the game. I guess it is a terminal. Every time I press something, a girl talks about a train and she talks to her father and other people. She also say's she is in Old Mombassa. Can anyone help me. I am not for sure if it is a terminal. I just know if a phone is ringing, you press RB and there will be a lady's voice.
Ok, it is a phone ringing in a booth.
Thank you!