Folks, I hope this is not a FAQ or some other kind of dumb question. I am currently running 1.2.10-BRIstuffed-0.3.0-PRE-1s using a straight-forward configuration mostly only for ISDN. However, I am also accepting anonymous SIP connections for external people calling me. This always worked until yesterday and I am currently trying to find out why it isnt working anymore. This is what is happening: The SIP invite UDP-packet is coming in. I can see it when doing a tcpdump. There is no Netfilter-rule set. Asterisk does not show the packet when doing "sip debug" nor does Asterisk send any reply. The packet is just repeated from the remote Asterisk for some time until its timing out. So I thought I should use an external SIP-client (softphone) that is authenticating with the Asterisk. This is working. The Asterisk replies properly. So short question: how to debug SIP packets that arrive but do not show up in Asterisk when doing "sip debug"? Any more details required? If yes, please ask. Thanks a bunch! Sascha