call

Outline to call a person (request a voice or video session) using their website:


 * 1) tantek writes a post on his site that says "hey aaronpk, do you have a minute to talk? https://talky.io/ttk"
 * 2) tantek's server sends a webmention to mine for that link
 * 3) my server notifies my phone via a push notification (possibly via mention-app)
 * 4) I see the message, click the talky URL, and we're in a video call

Additionally, this could happen with private posts so the talky URL is only visible to the two of us.