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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>You didn’t post the Asterisk version, but if this is an OLD asterisk version then the source IP may be missing from messages/logs.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>If you have low traffic in general then using something like Wireshark may help you examine any suspicious SIP packet on the PBX. For higher volumes it’s like drinking from a fire hydrant, so not suitable.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>If this is a small PBX, have a look at the SecAst product (https://teium.io/secast). It’s <u>free</u> for small installations. It’s an Asterisk security product that monitors network traffic at a the adapter level so it can sniff the source. It also talks to Asterisk through the AMI so it can get more details of the connection/session that way. If this is for a larger PBX then you would have to move the discussion to the biz list for more info on SecAst. (Or email me off list)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> asterisk-users [mailto:asterisk-users-bounces@lists.digium.com] <b>On Behalf Of </b>Jerry Geis<br><b>Sent:</b> Wednesday, July 22, 2020 11:37 AM<br><b>To:</b> Asterisk Users Mailing List - Non-Commercial Discussion <asterisk-users@lists.digium.com><br><b>Subject:</b> Re: [asterisk-users] Failed to authenticate device message<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><pre><span style='color:black'>>Did you check your security log?<o:p></o:p></span></pre><pre><span style='color:black'><o:p> </o:p></span></pre><pre><span style='color:black'>>There is usually a wealth of info there about who, what, where when and why<o:p></o:p></span></pre><pre style='white-space:pre-wrap'><span style='color:black'><o:p> </o:p></span></pre><pre style='white-space:pre-wrap'><span style='color:black'>I also checked /var/log/asterisk/messages and it just has the same line. Nothing additional.<o:p></o:p></span></pre><pre style='white-space:pre-wrap'><span style='color:black'><o:p> </o:p></span></pre><pre style='white-space:pre-wrap'><span style='color:black'>Jerry<o:p></o:p></span></pre><pre style='white-space:pre-wrap'><span style='color:black'><o:p> </o:p></span></pre></div></div></body></html>