The CALLHOME English Corpus is a collection of unscripted telephone conversations between native speakers of English. Here are the key details:

Participants: 120 individuals. Type of Study: Naturalistic. Location: USA. Media Type: Audio. DOI: doi:10.21415/T5KP54. Contents: The corpus contains 120 telephone conversations, each lasting up to 30 minutes. Origins: All calls originated in North America, with 90 calls placed to various locations overseas and 30 calls within North America. Transcripts: The transcripts cover contiguous 5 or 10-minute segments from recorded conversations. Speaker Awareness: All speakers were aware that they were being recorded. Topics: Participants had no guidelines on what to talk about; most called family members or close friends overseas. Purpose: Collected primarily to support the project on Large Vocabulary Conversational Speech Recognition (LVCSR), sponsored by the U.S. Department of Defense.