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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>ACLs on the router specifying H323 control
traffic to/from the callmanager servers (and gatekeepers if applicable) would
be all that is needed to prevent this.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Johan Bloemhard<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, September 18, 2006
10:06 AM<br>
<b><span style='font-weight:bold'>To:</span></b> cisco-voip@puck.nether.net<br>
<b><span style='font-weight:bold'>Subject:</span></b> [cisco-voip] H.323
Gateway Security - Prevent Unauthorized Usage</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>We have a 2801 with a H.323 gateway (PSTN). I just
came across a student that was using IP Blue (VTGO) on their handheld and had configured
it using our H.323 gateway. I imagine that he got the IP of the H.323
gateway off of a phone. Obviously he didn’t have internal dialing
but could dial out with a problem.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>How can we prevent this? ACLs on the 2801? How
are other organizations tackling this problem?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>TIA<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Verdana><span style='font-size:7.5pt;
font-family:Verdana'>Johan Bloemhard <br>
Senior Information Technology Specialist <br>
___________________________________ <br>
<st1:place w:st="on"><st1:PlaceName w:st="on"><strong><b><font face=Verdana><span
style='font-family:Verdana'>Silver</span></font></b></strong></st1:PlaceName><strong><b><font
face=Verdana><span style='font-family:Verdana'> <st1:PlaceType w:st="on">Falls</st1:PlaceType>
<st1:PlaceType w:st="on">School District</st1:PlaceType></span></font></b></strong></st1:place><strong><b><font
face=Verdana><span style='font-family:Verdana'> 4J</span></font></b></strong> <br>
<st1:address w:st="on"><st1:Street w:st="on">802 Schlador Street</st1:Street> <br>
<st1:City w:st="on">Silverton</st1:City>, <st1:State w:st="on">OR</st1:State> <st1:PostalCode
w:st="on">97381</st1:PostalCode></st1:address> <br>
w: 503.873.6331 </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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