Linphone Error 'Your machine appears to be connected to an IPV6 network. By default linphone always uses IPv4. Please update your configuration if you want to use IPv6'

To resolve this error you can disable the IP V6 in your system as mentioned below. (I have successfully done this in ubuntu 12.04)

1. sudo gedit /etc/sysctl.conf


2. Now add these lines at the end of file:
   

# IPv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1



3. Save sysctl.conf file and close.


4. Now Restart the system