Hello Ross,
Thanks for your help!
- flags, cannot find anything about that ?
Explained in 8.2 here https://kamailio.org/docs/modules/devel/modules/uac.html
I was looking at the documentation that matched my Kamailio version 5.4.x, as found in Debian stable. But I had not seen the [separate] section "9. Remote Registration". *oops*
Thanks for the clear answers!
-Rick