If you are adventurous, here the process to have Hipchat working in your favourite IRC client:
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First, you need to install the IRSSI XMPP plugin. You can find this package in your distribution, but I advice you to use the latest version possible if you don't want this segfault errors everywhere: http://gna.org/bugs/?20487
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The first version released after the patch fix is the 0.52-2 that you can download here: https://launchpad.net/ubuntu/+archive/primary/+files/irssi-plugin-xmpp_0.52-2_amd64.deb (No dependencies so it should work in any Debian distributions)
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Once it's done. You have to configure IRSSI. Either via command line, either manually in the ~/.irssi/config file. I followed this thread: http://cybione.org/lists/irssi-xmpp-list/msg00339.html and it was pretty successful.
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You can find your XMPP access on your HipChat account on this page: https://boxuk.hipchat.com/account/xmpp. Everything has a XMPP account id. Even the Rooms name. So you have to use these instead of the real names for your I