asterisk:
 * bump version to [http://downloads.asterisk.org/pub/telephony/asterisk/releases/asterisk-11.8.1-summary.html 11.8.1] rev [http://svnview.digium.com/svn/asterisk/branches/11/?view=log 410609]
 * refs #706


git-svn-id: file:///var/svn/freetz/trunk@11867 149334a1-2f27-0410-a3b9-fc62619ac1e6