Missing authentication header in asterisk register

Hi all,

I’ m trying, with no luck, to register asterisk to a OpenImsCore platform.

I created an asterisk user on the IMS platform and wrote the following lines in the asterisk sip.conf file:

register => asterisk:asterisk@open-ims.test:4060/open-ims

type = friend
auth = md5
qualify = yes
insecure = very

but the user is not registrered, in more details the pcscf complains about the missing Authorization header.

I also took an ethereal screenshot of the asterisk - OpenIMS dialog and I verified that the header is really missing, while in a succesfull registration from another IMS client the header is present.

So, does anyone there know how to configure asterisk to send a correct IMS registration?

Thanks in advance