On Fri, Aug 03, 2012 at 11:51:42AM +0500, Muhammad Yousuf Khan wrote: > is there any substitute of office communication server in Linux for > inter office communication, voice, video, chat file transfer (support > centralized environment not just work on broadcast for e.g unlike > outlook messanger). Have a look at XMPP. The Jingle extension allows Voice and Video conversations and the Proxy65 extension allows file transfers. As with OCS, you can run your own server for access only by office staff. Prosody is a good server to start with, but ejabberd is somewhat more powerful and scalable. In terms of client, any XMPP client will do (Pidgin, Empathy etc).
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