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<p class=MsoNormal><span style='color:#1F497D'>What do your configs look like
on the h323 gateways?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>-Go0se<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
cisco-voip-bounces@puck.nether.net [mailto:cisco-voip-bounces@puck.nether.net] <b>On
Behalf Of </b>Keith Allan<br>
<b>Sent:</b> Sunday, May 17, 2009 3:45 AM<br>
<b>To:</b> cisco-voip@puck.nether.net<br>
<b>Subject:</b> [cisco-voip] Incoming H323 Calls Fail to Connect<br>
<b>Importance:</b> Low<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-GB>We have a customer running CUMC V4 with a
remote site across a private leased line. At the remote site we have IP
phones and two H323 voice gateways. Users at the remote site can make internal
local calls and calls across the WAN. They can make and receive calls through
both the H323 gateways in the remote site.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>The customer now has a 20Mb Metro-Ethernet
MPLS circuit between the two sites and has re-routed the traffic between the
two sites from the private leased line to the MPLS circuit.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Following this change, the users at the
remote site can still make internal local calls and calls across the WAN.
They can make outgoing calls through either of the two H323 voice gateways at
the remote site.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>The problem is with incoming calls through
either of the voice gateways at the remote site. When either of the two
remote H323 gateways receives an incoming call, it rings the extension but when
the user takes the phone off-hook, the calling party still hears ringing and
the called party hears nothing. If the called party places the phone back
on-hook, it starts ringing again. If the calling party continues to wait,
the call goes to voicemail.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Debugging the H225/245 on the gateway, we
see the H225 signalling traffic to the CUCM when the call comes in but when the
phone is taken off-hook to answer the call, there is no H225/245 traffic back
from the CUCM to complete the e call.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>If we re-route traffic back across the
leased line, it all works fine.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>All routing has been thoroughly checked and
none of the H323 source bind addresses have been changed. Our next step
is to take sniffer traces from each end of the link to analyse the H323.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>The only time I have seen something similar
was when a firewall in the MPLS cloud decided the H225 traffic was a DOS attack
and closed the session but we are assured there are no firewalls in the
network.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Has anyone seen anything similar or have
any ideas what may be causing the problem.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-GB
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p>
<p align=center style='text-align:center'><span lang=EN-GB>This message has
been scanned by <a href="http://www.mailcontroller.altohiway.com/">MailController</a>.<o:p></o:p></span></p>
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