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In many companies firewall restrictions are pretty strict. For example in our company every employee, who wants to use additional ports, needs to sign a formal paper, which has to be accepted by our manager aso. Since I want to use eg. the 'developer cooperation' feature and its not a real option that every employee who wants to use this feature too applies for an exception in the firewall, I suggest to add a 'skype' like feature to connect to the collab server. See example: http://www.rubyinside.com/skype-style-firewall-busting-with-ruby-and-udp-399.html
Reassigning to issues@collab. Collab Support plugin is not actively maintained. Obsoleted in 6.7 by the newly introduced integration with Project Kenai, a collaborative environment for developers to host their open-source projects, which includes also a chat service.