The steps involve configuration of rewrite rules in IIS and changing the Voyager URL and context path parameter in Voyager.
Enable WebSocket Protocol for IIS
...
On the taskbar, click Server Manager.
In Server Manager, click the Manage menu, and then click Add Roles and Features.
In the Add Roles and Features wizard, click Next. Select the installation type and click Next. Select the destination server and click Next.
On the Server Roles page, expand Web Server (IIS), expand Web Server, expand Application Development, and then select WebSocket Protocol. Click Next.
On the Select Features page, click Next.
On the Confirm installation selections page, click Install.
On the Results page, click Close.
Two IIS modules are required for this configuration
...
Open Voyager.vmoptions file and add/modify the following parameter:
-Dport=8888
-Dcontext.path=<your-context-path>
...