Issue while registration

[Aman1]

Request register failed from ‘'sip:000012345@abcd.co.in” for 192.12.13.13 (callerid:7619119c————)-failed to authenticate.

Wherever some users are able to call seamlessly.but most of new user which account recently created showing this error.pls find attachment

Please suggest

[jcolp]

You haven’t described your setup or provided configuration. That would be needed, along with an actual SIP trace and console output instead of a picture.