I was able to successfully use the auth_ephemeral module on my environment:

Kamailio > Asterisk > ARI

I ran into a problem with ARI, where Asterisk wouldn't send the complete from URI to ARI program, just the first part (timestamp), and the most important part (the username) isn't forwarded.

For example:

Kamailio username: 1649106119:1001

Asterisk only forwards 1649106119 to ARI, which makes it impossible for me to track the user.

So I planned on using the deprecated username_format from Auth Ephemeral module:

By switching the timestamp with the username, my problems would be fixed.

After setting the variable, and trying to register on Kamailio with username 1001:1649106119, I get an error message: SIP/2.0 400 Bad From URI

Am I doing something wrong?

Thanks!