Freeswitch Module

 

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The FreeSWITCH module enables voice in OpenSim with no changes required to the Linden Labs Second Life viewer (must be between 1.22 and 1.23.5 - 2.x viewers do not work at present), Hippo viewer (0.5 or after), and perhaps others using SLvoice.exe module.

A little history on the development of the FreeSWITCH module is given here:

• http://zaki.asia/2009/04/28/freeswitch-module-in-opensim/

FreeSwitch Install

Follow the instructions here on how to compile from source. We need to enable two specific modules. Please ensure you compile from the freeswitch trunk for now until we can post a minimum version number (there are known issues with older versions)

When you get to the part in the instructions where it says "Edit modules.conf so that it will build the modules you desire." edit the modules.conf file and uncomment to make active the entries for xml_curl and the siren14 codec

   codecs/mod_siren
 and
 xml_int/mod_xml_curl

• You can also use this guide for setting it up in a quick way -- Fly-man-

FreeSwitch Config

Install and compile Freeswitch, making sure you enable the xml_curl module and also the siren14 codec.

enable mod_xml_curl

Next, do not forget to activate mod_xml_curl in /usr/local/freeswitch/conf/autoload_configs/modules.conf.xml. mod_xml_curl is disabled by default on fresh install.

uncomment the lines...

   <load module="mod_xml_curl"/>

and

   <load module="mod_siren"/>

configure mod_xml_curl

The xml_curl module configuration should point to an opensim region that has the Freeswitch voice module enabled (voice also needs to be enabled in the estate setting for all regions you wish to be supported).

example xml_curl.conf.xml found in /usr/local/freeswitch/conf/autoload_configs

 <configuration name="xml_curl.conf" description="cURL XML Gateway">
<bindings>
     <binding name="example">
             <param name="gateway-url" value="http://youropensimregionip:9000/api/freeswitch-config" bindings="directory"/>
             <param name="gateway-credentials" value="freeswitch:password"/>
             <param name="disable-100-continue" value="true"/>
     </binding>
     <binding name="local">
             <param name="gateway-url" value="http://youropensimregionip:9000/api/freeswitch-config" bindings="dialplan"/>
             <param name="gateway-credentials" value="freeswitch:password"/>
             <param name="disable-100-continue" value="true"/>
     </binding>
</bindings>
</configuration>

The /usr/local/freeswitch/conf/vars.xml requires modification to enable the siren14 codec

search within vars.xml for the global_codec_prefs and change the line to read

   <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G7221@32000h,G722,PCMU,PCMA,GSM"/> 

or

   <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G7221@32000h,G7221@16000h,G722,PCMU,PCMA,GSM"/>

G7221@32000h is the siren14 codec

configure conference.conf.xml

By default, FreeSwitch plays hold music when there is only one avatar in the conference and beeps for everyone when avatars arrive and leave. To disable, edit /usr/local/freeswitch/conf/autoload_configs/conference.conf.xml. Locate the "default" profile and comment out the following lines as shown below:

      [...]
    <!-- File to play if you are alone in the conference -->
    <!-- <param name="alone-sound" value="conference/conf-alone.wav"/> -->
    [...]
    <!-- File to play when you're alone (music on hold)-->
    <!-- <param name="moh-sound" value="$${hold_music}"/> -->
    <!-- File to play when you join the conference -->
    <!-- <param name="enter-sound" value="tone_stream://%(200,0,500,600,700)"/> [^] -->
    <!-- File to play when you leave the conference -->
    <!-- <param name="exit-sound" value="tone_stream://%(500,0,300,200,100,50,25)"/> [^] -->
    <!-- File to play when you ae ejected from the conference -->
    <!-- <param name="kicked-sound" value="conference/conf-kicked.wav"/> -->
    [...]

OpenSim Config

Add the following section to OpenSim.ini. You will also need to enable voice in the regions estate settings. Make sure the freeswitch server is started BEFORE bringing the region up.

   [FreeSwitchVoice]
 enabled = true
 ; FreeSwitch server is going to contact us and ask us all sorts of things.
 freeswitch_server_user = freeswitch
 freeswitch_server_pass = password
 freeswitch_api_prefix = /api
 ; IP address of an opensim region with voice enabled
 freeswitch_service_server = youropensimregionip
 ; the port your Opensim region is running on
 freeswitch_service_port = 9000 
 ; your freeswitch IP address
 freeswitch_realm = yourfreeswitchserverip
 freeswitch_sip_proxy = yourfreeswitchserverip:5060
 ; STUN = Simple Traversal of UDP through NATs
 ; See http://wiki.freeswitch.org/wiki/NAT_Traversal
 freeswitch_attempt_stun = false
 freeswitch_stun_server = stun.freeswitch.org
 ; Echo server MAY not used but information MAY be
 ; required to relay to Freeswitch server (TBC?)
 freeswitch_echo_server = yourfreeswitchserverip
 freeswitch_echo_port = 50505
 freeswitch_well_known_ip = yourfreeswitchserverip
 freeswitch_default_timeout = 5000
 freeswitch_subscribe_retry = 120
 ; freeswitch_password_reset_url =
 ; opensim_well_known_http_address = youropensimregionip
 ; CHECK THIS...  should be Address_Of_Your_SIM_HTTP_Server_Hostname_Allowed

Note that if you are running in Opensim grid mode, a single Freeswitch service on yourfreeswitchserverip can support multiple regions on one or more Opensim.exe running on one or more hosts. And the Freeswitch server need not be on the same host as the Opensim.exe used to anchor the connection.

Note STUN server "stun.freeswitch.org" is an example only, and its availability should not be relied upon for a service.

Firewall Config

Make sure that the ports used by Freeswitch are acessible though your firewall(s). In the example above the main port used is 5060 though other ports may be used for call initiation (port 1720 for H.323 Call Signaling) and dynamically assigned ports for specific call traffic. The usual H.323 and SIP traffic dynamic port handling on modern firewalls usually enables this.

Is port 50505 actually used, or is it just something that must be
reported by OpenSim when the Freeswitch service makes contact?

More details on the Freeswitch ports used and firewall configuration details are at http://wiki.freeswitch.org/wiki/Firewall

If you have problems with NAT/Routers look at using STUN (Simple Traversal of UDP through NATs). More information at http://wiki.freeswitch.org/wiki/NAT_Traversal

Issues & Solutions

NOTE: FreeSwitch is not a core module and help may not be forthcoming to handle issues.

MAKE SURE the OpenSim region you point Freeswitch at IS NOT running when you start FreeSwitch.

ALSO make sure that you have enabled voice in the "About Land"->"Voice" dialogue in the region, you will need to be a region admin to do this.

Check the plot also has voice enabled. You must be a plot owner or have suitable permisison to do this. Recent Linden Labs Second Life viewers do not offer this option, so use Hippo or another client which does.