[asterisk-users] error message

[Rilawich Ango]

Recently, I got the following error messages in CLI periodically.

Jan 20 17:43:18 ERROR[8641]: chan_sip.c:11002
handle_request_subscribe: Got SUBSCRIBE for extension
XXXXXXXXXXX at from-int from 192.168.0.123, but there is no hint for that
extension

I have no idea what the error message tell me.  I am sure I haven't
that account XXXXXXXXXXX in my database and there is no hint
extensions in dial plan as well.  Anyone can help tell me why there is
such an error message?

asterisk version: 1.2.10
using realtime with mysql

Thanks!