> For the complete documentation index, see [llms.txt](https://docs.facephi.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.facephi.com/docs.facephi-en/sdks/backend-sdk/voice/release_notes/2.5.0_release_notes.md).

# 2.5.0

In this Version of facephi-voice-service, support has been added for new audio formats: AAC, PCM ulaw and mulaw, WMA, MP4, FLAC, ALAC and AIFF. In addition, support has been added for audio with a sampling frequency below 16 kHz. Finally, Tracking events are integrated for authentication.

### Added

* Support for new audio formats: AAC, PCM ulaw and mulaw, WMA, MP4, FLAC, ALAC and AIFF.
* Support for audio with a sampling frequency below 16 kHz.
* Tracking events are integrated for authentication.