@Iris Zhang, Based on my understanding, your question is related to Speech-to-text feature of Azure AI. In case your question is about something else, please let me know.
For offline mode, the option to use Docker containers in disconnected environments is available for which request can be used using specified form here - Request access to use containers in disconnected environments
For more details, see Use Docker containers in disconnected environments
Please let me know if you have any questions.
If the answer did not help, please add more context/follow-up question for it. Else, if the answer helped, please click Accept answer so that it can help others in the community looking for help on similar topics.