Command line Twilio client - part 2

[This is continuation of the previous post]

The command line SIP endpoint included in my rtclite project allows SIP registration to register with a SIP server to receive SIP calls. For example, you can signup for a free SIP account at iptel.org, download rtclite and py-audio on OS X, open two terminals, run the rtclite.app.sip.caller app on one to register, and on another to place a call as follows: