Does Asterisk support SIP MESSAGE message

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http://serverfault.com – I am trying to figure, if Asterisk can support SIP MESSAGE message outside of established call. I have to use SIP MESSAGE in order to simulate a near-real-time chat functionality (it's a project specification). Until now my research shows, that this is not possible. Most people use XMPP or other means to achieve IM functionality, or install OpenSer in front of Asterisk. I am wondering if there's a patch or something that can add this message processing to Asterisk. (HowTos)