npm init
npm install --save joseph-onsip/SIP.js#2d89c636f754349a188e6c229bd7f3aaa6ad3627
npm install --save joseph-onsip/sip.js-auth-onsip#c42cd65c130ab2252be9a5f75e7d02e20f9da570
npm install --save-dev beefy browserify
git add index.js
move buildUA/invite out of streamPromise.then
prompt for only referer uri, use anon UAs for referee/target