WebRTC calling from Firefox on CyanogenMod to Chromium on Debian wheezy

Just how easy is it to make a call with WebRTC?

Here I have two endpoints:

Type in the callee's SIP address...

Select front camera, grant permissions

The permissions have to be granted each time a call is made. This is to protect the privacy of the user.

Call viewed from mobile device

Call viewed from browser on laptop