stun server installation for webrtc2sip

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Hi,

I need to make calls between sipml5 web clients and legacy sip clients. 
Everything is working when I am connected with internet. However whenever I try 
the same configurations and clients inside static IP configured network without 
internet access, then audio voice is not coming at both sides.

And when I googled the same, I found that google.com stun server does not work 
without internet connection. So I need to install local stun server. 

However I want to use webrtc2sip without stun server installation, so I just 
disabled ice setting as below in webrtc2sip's config.xml file, still not 
working.
<enable-icestun>no</enable-icestun>

Please let me know that is it mandatory to install local stun server or I can 
use without stun server. If possible, then please provide the 
settings/configurations.

Environment : Firefox 24, Asterisk 11.6-cert9, sipml5 latest version, 
webrtc2sip latest version

Thanks and Regards
Vinod Pandey

Original issue reported on code.google.com by [email protected] on 4 Feb 2015 at 9:09