Hi, I am playing with Python pjsua and can make calls using code below: http://trac.pjsip.org/repos/browser/pjproject/trunk/pjsip-apps/src/python/samples/call.py However before making a call PJSUA will always REGISTER with a SIP server. Could someone suggest how to make an outbound call with SIP authentication (username/password) without registering first? Regards, Chris