[SR-Users] Kamailio and user registration and a question on STUN servers

Hello Group: I am looking for a way to allow any SIP client to register to my (development) network without having to be already registered in the database. Is there a way for the user client to register and create a valid user subscription in the database? The SIP clients I am using have hard coded passwords and I can not change them. I think once loaded into the database, I can delete the ones I do not want later after I close automatic registration feature... The second question is on STUN servers. Is there a good way to test to see if one is working from outside your network? I was looking for some sort of web based tool I could access to see if my public STUN server is really working. I am using the "reTurnServer" software on Linux. I am only allowing TCP based STUN requests. Thank you. Sample log entry for a external user trying to access the development network. I would like to give this person access to place calls on the system. 199.58.xxx.xxx.nebraskalink.com - - [25/Aug/2016:18:02:49 +0000] "GET /download/?ojo-mac=00:02:54:00:a5:eb&ojo-id=2000-0005-2F52&ojo-rev=rev02.01.15&ojo-config-id=e712e6cb088ab9b4ef246488b979cbf6&ojo-stun-type=Blocked&ojo-sn=15190252560146703100&ojo-key-id=e0142f126a5197845a24f33deedc358645e67e5f HTTP/1.0" 200 1812 "-" "Wget/1.9.1"