Cannot register pjsua with freepbx

Hi everyone,

I have hard time making pjsua register with Freepbx:
Freepbx is not responding at all to pjsua REGISTER (both perfectly reachable from each other)
According to pjsua forum discussion, the issue is elsewhere (Freepbx config)
Here I included the extension config:

pjsua command used:

/pjsua-x86_64-unknown-linux-gnu --id sip:[email protected] --registrar sip: --realm “*” --username 101 --password user101

Freepbx config:

According to wireshark packet capture, the client REGISTER packet sent by pjsua doesn’t contain the authorization header.
Here is the packet capture compared to working linphone registration:

From rfc3261

If no credentials (in the Authorization header field) are provided in the request, the
UAS can challenge the originator to provide credentials by rejecting
the request with a 401 (Unauthorized) status code.

In my case Freepbx doesn’t respond at all to the UAC.

Any help is appreciated.