By default, requests aren't logged (neither audio nor transcription). If necessary, you can select the Log content from this endpoint option when you create a custom endpoint. You can also enable audio logging in the Speech SDK on a per-request basis, without having to create a custom endpoint. In both cases, audio and recognition results of requests will be stored in secure storage. Subscriptions that use Microsoft-owned storage will be available for 30 days.
You can export the logged files on the deployment page in Speech Studio if you use a custom endpoint with Log content from this endpoint enabled. If audio logging is enabled via the SDK, call the API to access the files. You can also use API to delete the logs any time.