Introduction

Whisper is an alternative voice system for OpenSimulator. It consists of an OpenSimulator region module and a Vivox SLVoice.exe replacement that must be installed on every viewer accessing the region using Whisper.

Whisper is implemented using the Mumble open-source voice chat project. On the server side, the Whisper region module connects to an unaltered Murmur server (Murmur is the name of the server component of Mumble). On the client side, the Whisper executable extends the existing Mumble voice client to implement the binary message interface between the SLVoice executable and the main viewer binary. The Mumble version of SLVoice needs to look exactly the same to the viewer as the original SLVoice.exe. The Whisper client is only available for Windows (although Linux and probably Mac OSX versions can be built). The client comes with an installer which replaces SLVoice.exe with the Whisper version and stores the original executable in a same place, so that it can be restored if/when necessary.

Information is available via these links:

• http://whisper.vcomm.ch/forum
  • Initial Version 27-Dec-2010 - http://whisper.vcomm.ch/forum/viewtopic.php?f=2&t=62
  • Instructions in French - http://angefg.wordpress.com/
• http://mumble.sourceforge.net/

The Whisper solution from vComm was the idea of Volker Gaessler, founder of vComm, and works by replacing the SLVoice.exe executable with a Mumble client that looks exactly the same to the viewer process. A process to change between the standard Vivox SLVoice.exe executable and the Mumble one within any specific viewer installation is available.

You will use the unchanged Mumble server (called Murmur) and a region module called Whisper. Communication is over ICE.

Firewall Information

You only need to open the port(s) mentioned in your OpenSim.ini and murmur.ini files.

• SIP Ports
• ICE Ports

Mumble/Whisper Test Regions

See whisper test region on Francogrid:

• Hypergrid link at (6995,7004) from OpenSim 0.6.9: 178.63.103.67:9011:WhisperTest
• http://whisper.vcomm.ch/forum/viewtopic.php?f=3&t=66#p102

Other OpenSim Voice Solutions

FreeSWITCH - See Freeswitch_Module

Vivox - It is also possible to use the standard Vivox setup if you have access to Vivox services, and a licence to use them in your setup.