I promised in the previous post about Google Talk’s support for federation to check what open source Jabber servers supports the DialBack protocol described in RFC 3920 used by Google Talk server to talk to other Jabber server.
Well… it seems that the dialback protocol is supported by all server listed here and a bunch of other non open source servers not listed there.
This is a good thing, but it seems the dialback protocol is not encrypted like the other TLS and SASL server-to-server protocols. On the other hand all other IMs today are not encrypted by default so privacy issues regarding this are legitimate as to the rest of the IMs available.
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