support voice calling via xmpp/jingle transport

this is merely a question: since there is (I assume) the vision of Calls supporting encrypted calls via matrix as a transport, is there currently plans to support audio via xmpp/jingle as a transport? This would equally "tie together" Chats and Calls as matrix integration would but would be far easier form a technical standpoint:

Chats/xmpp is ready and Calls can look at how Pidgin does it, https://bitbucket.org/pidgin/main/src/default/libpurple/protocols/jabber/jingle/ right?

As for the "tying together", I'd really start out simple for demoing: initiating an xmpp/jingle call via Calls commandline or gnome-contacts (would it actually call Chatty in background?) and of course Chatty would need to start Calls on an incoming call.

Since calls says "Unencrypted call" when using the cellular transport, we would get very close to supporting "encrypted call" when adding the SRTP jingle extension https://xmpp.org/extensions/xep-0320.html to the backend (many xmpp clients like the Conversations.im Android app use that already).

You see, I don't really have experience with the technical side of this, but in my mind, this would be the easiest way to do encrypted IP based voice calls for us right now.