I added sip to the supported list of protocols for links in ''scheme.local.conf'' and added a sip link, however that gets converted to a mailto: link, probably because it thinks that the "@" indicates that it is an email address.
The same happens on xmpp links.
When I change the @ to %40 to hide it, the resulting link is an internal wiki link which is not parsed correctly either:
I wonder if there is a setting to change that, otherwise I think its a bug in the url handing process