Audio message not available at address other than localhost

Description:

The voicemail option is only available on localhost.
When uploading the application to a server, the function disappears even though it is enabled in: ADMINISTRATION > MESSAGE > VOICE MESSAGE

Steps to reproduce:

1. Upload the application on localhost
2. Upload the application to some server
3. Notice that the voice message option disappears when uploading the application to a server

Expected behavior:

The function should normally be present just like in localhost.

Actual behavior:

The voice message function disappears when uploading the application to some server.

Server Setup Information:

• Version of Rocket.Chat Server: 3.17.0 / 3.18.0 / 4.3.2
• Operating System: Windows 10 / Linux Mint / Ubuntu 20.04
• Deployment Method: Docker
• Number of Running Instances: 1
• DB Replicaset Oplog:
• NodeJS Version: 12.22.8
• MongoDB Version: 4.0.27

Client Setup Information

• Desktop App or Browser Version: Google Chrome / Opera
• Operating System: Windows 10

Additional context

Relevant logs:

No source file, test, or entry point is named. Reproduce the missing voice-message option with the stated localhost and server Docker setups, then compare the browser and server behavior; done when the option remains available on a non-localhost deployment while enabled in Administration > Message > Voice Message.