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U can get the head Version of Asterisk from below link:
http://www.inaccessnetworks.com/projects/asterisk-oh323/download
Posted by sagitraz
You can access the head version of Asterisk in a couple of ways. The most basic is by downloading the source code from the Digium site at www.asterisk.org/download.
The most current release is listed in a column on the right side of its Web site listing the files and a release number. Head version have beta in their names.
Posted by william