Hi All, Asterisk 1.4.12 on CentOS 5 Yesterday and today I got the following warnings in /var/log/asterisk/messages: WARNING[2066] chan_sip.c: Got authentication request (401) on unknown REGISTER to '<sip:account at sip.voipuser.org>;tag=d8f15e1f30efddd35168b07dba9d540e.3922' The corresponding bits in sip.conf are: register => <account>:<secret>@sip.voipuser.org/<TelNo> and [TelNo] type=friend context=external nat=yes username=<account> secret=<secret> host=sip.voipuser.org fromuser=<account> fromdomain=voipuser.org insecure=very qualify=yes canreinvite=no Checking voip-info.org, I see that a 401 response means that the requester is unauthorized, but I'm unsure whether that also means the requester is not authenticated or even whether it's my VSP's server or my Asterisk system that's returning the 401. I've only used the number for incoming calls, which can still be made to this number. However, I'd like to retain the ability to make the occasional outgoing call via this service. What do these warnings mean, do I need to worry about them, and how can I stop them? TIA, -- Geoff