[Evolution] Sharing Contacts with Ring

[David Burleigh <david burleigh gmx com>]

I recently installed Ring (ring.cx) and it automatically picked up all my Evolution contacts. The problem is, they are useless in Ring unless I can add Ring IDs as "phone numbers" in Evolution. This is the answer I got on the Ring mailing list when I asked about it from that end:

You can add or manage contacts by adding the Ring IDs as telephones (and keep the "ring:" prefix), or as instant messaging and presence protocol (IMPP) (in this case, your version of GNOME Evolution must provide option to add the "[GNU] Ring" protocol, the "ring:" prefix, or provide a way *not* to specify the protocol so that you can add the prefix yourself).

So is there some way to facilitate this in Evolution? (I'm using version 3.18.5.2)