And I think this could work on the Kindle, too. It's just that nobody did a port of an SIP client yet. Well, strictly speaking, some software wouldn't even be needed to get ported. I can see no reason why e.g. a CLI client - let's say from a Debian install - wouldn't work as-is. Well, maybe the firewall settings must be fitted to this, but it should work.
However, the harder part would be to port a full GUI client since there probably isn't any existing software that is fitted to the Kindle environment in that regard.
As far as I can see, sjphone is proprietary software and would legally impossible, technically almost impossible to port.
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