It's just a notice that there's a register attempt. If it's every 30 or 60 minutes from a known extension, it's fine.

It's there for fail2ban to notice excessive register attempts so it can block abuse from clients that try to register but don't submit a password to avoid setting off the warning bells.

-Avi



On Wed, Jun 15, 2011 at 1:33 AM, Henk Oegema <henk@oegema.com> wrote:
What is the meaning of getting (regular) this message:
.....[WARNING] sofia_reg.c:1241 SIP auth challenge (REGISTER) on sofia profile 'internal' for [1001@10.0.0.101] from ip 10.0.0.12 ??

Extension 1001 is a Portech GSM gateway MV370.

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