I think it keeps receiving 401 and then you create a new branch, forward again until the
max number of branches is exceeded (by default is 12, it can be changed via max_branches
global parameter, up to 31 iirc -- see core cookbook for proper details).
For discussing further, use sr-users(a)lists.sip-router.org, the issue tracker here is
intended for bugs and feature requests, to keep it focused on development related matters.
Sorting out configuration file issues is for users mailing lists.
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Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/issues/507#issuecomment-183221055