[asterisk-users] What is this error message? (check_auth: stale nonce received from ...)

[Mike]

I`ve been noticing alot of those messages in the CLI lately:
Apr  5 11:18:02 NOTICE[25593]: chan_sip.c:6444 check_auth: stale nonce
received from '<sip:reg-1 at pbx.domain.com>
 
I haven't changed my configuration in ages.  What could be the cause of this
suddent appearance?
 
Mike
 
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