Hello,<br><br>I am interested in knowing what are the advanced topics that can be learned in Asterisk. It would be helpful if there are any reference books or tutorials on Asterisk that cover advanced concepts on Asterisk.<br><br>Thanks in advance!<br><BR><BR><FONT face=arial color=#aa4d4e size=3><STRONG><IMG src="http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/40.gif"> <FONT size=2>A Successful Person Is The One Who Can Lay A Firm Foundation With The Bricks That Others Throw</FONT></STRONG></FONT><IMG src="http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/40.gif"><p> 
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