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@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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