fake auth rejection??

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Very occasionally in my logs I see things like this. In this case 7
lines starting with the first line and each ending with one of the
group of 7. Took about 10 seconds for the 7 tries.

[2012-05-03 16:58:27] NOTICE[31850] chan_sip.c: Sending fake auth
rejection for device “unknown”

;tag=aTZ1eFu5Gi
;tag=MQ7X2xPoIy
;tag=FnfiJEymn6
;tag=tVPso6QAEp
;tag=tWHOjRp11z
;tag=DK42h3mLn1
;tag=CPW3Z9lDvN

Should I be worried?

Ira