Asterisk 1.8.0 was released 2 days ago. The first thing that came to my mind when I saw the main feature list was that it is catching up on Freeswitch.
As on http://www.asterisk.org/node/51454, the main features include
IPv6 Support in the SIP channel driver
Connected Party Identification Support
A new call logging system, Channel Event Logging (CEL)
Distributed Device State using Jabber/XMPP PubSub
Call Completion Supplementary Services support
Advice of Charge support
The complete list of new features can be found on http://svn.digium.com/view/asterisk/branches/1.8/CHANGES?view=markup (supposibly, because I can't open the link)
The full changelog is here http://downloads.asterisk.org/pub/telephony/asterisk/ChangeLog-1.8.0
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