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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have a very interesting issue at a client I am working
with. We are converting this customer from a Nortel to CallManager. This
customer is using IP phones already. There are four locations that are
converting to IP phones. All four locations will be using a single 3825 voice
gateway to the PSTN. We connected the phones at one location and configured the
gateway as an MGCP gateway. We have two Bellsouth ISDN PRIs connected to the
gateway that came out of the Nortel. The ISDN connections come up with no
problem. We have verified the Frame type with the Bellsouth and the PRI are
working fine. The phones are using PoE and are getting the IP address via DHCP
and are using a voice VLAN. The PCs are connected to the access port on the
phones. The Phones register to the Subscriber just fine. Calls are being routed
to the Gateway with no problem. Inbound calls make it to the IP phones fine. So
you are asking then what the problem is. There is no audio on the call or ring
back. The call sets up fine. The ISDN debugs show no errors. The phone
maintains the connection until you hang up. And if you look at the RTP and UDP
debugs it is sending and receiving the RTP traffic without issues or appears to
be. You can start an ISDN Q931 debug and make a call. When the call is
connected look at the traffic info on the phone and everything appears as it
should accept there is no audio, static or anything. We have made calls from
different phones, phone types (7961, 7912, and IP Communicator) with the same
result. IP connectivity is good. There are no IP routing issues. We upgraded
the IOS on the Gateway. We caused the phones to go into SRST mode to remove the
CallManager from the equation and it was the same result. Cisco to Cisco calls
work great. This one has TAC scratching there head. If anyone has ever seen a
problem like this or have any other suggestions I would really appreciate your
input.<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><em><i><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>David Fielder</span></font></i></em><o:p></o:p></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>Senior Engineer</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>Dimension Data</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>Office: (336) 510-9431</span></font><o:p></o:p></p>
<p class=MsoNormal><st1:City w:st="on"><st1:place w:st="on"><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Mobile</span></font></st1:place></st1:City><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>:
(336) 669-5129</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a href="mailto:david.fielder@us.didata.com">david.fielder@us.didata.com</a></span></font><o:p></o:p></p>
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12.0pt'><o:p> </o:p></span></font></p>
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