**Introduction** Multi-Language Conversational Telephone Speech 2014 - Slavic Group (LDC2026S10) was developed by the Linguistic Data Consortium (LDC) and is comprised of approximately 20.63 hours of Polish and Russian conversational telephone speech recordings. The data was collected primarily to support research and technology evaluation in automatic language identification; portions of these recordings were used in the NIST 2015 and 2017 language recognition evaluations. The collection focused on language pair discrimination for 20 languages/dialects, some of which could be considered mutually intelligible or closely related. **Data** This corpus contains 96 recordings covering Polish and Russian. Participants were recruited by native speakers who contacted relatives and acquaintances in their social networks. Those native speakers made one call, typically lasting at least 8 minutes, to each acquaintance. The data was collected using LDC's telephone collection infrastructure. Human auditors labeled calls for language, callee gender, native-speaker status, and speech clarity. All audio data is presented in FLAC-compressed MS-WAV (RIFF) file format (*.flac); when uncompressed, each file is 2 channels, recorded at 8000 samples/second with samples stored as 16-bit signed integers, representing a lossless conversion from the original mu-law sample data as captured digitally from the public telephone network.

Creator(s)

Karen Jones

Stephanie Strassel

Kevin Walker

David Graff

Jonathan Wright

Distributor(s)

Linguistic Data Consortium

Right Holder(s)

Linguistic Data Consortium