[cisco-voip] 3825 Voice Gateway Issue
David Fielder (US)
David.Fielder at us.didata.com
Mon Oct 16 16:23:24 EDT 2006
I will see about getting a capture. I have not done any PCM dumps
David Fielder
Senior Engineer
Dimension Data
Office: (336) 510-9431
Mobile: (336) 669-5129
david.fielder at us.didata.com
-----Original Message-----
From: Ryan Ratliff [mailto:rratliff at cisco.com]
Sent: Monday, October 16, 2006 3:17 PM
To: David Fielder (US)
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] 3825 Voice Gateway Issue
Can you get a sniffer capture at the phone and recreate the audio in
the capture file?
Have you done PCM dumps at the router yet?
-Ryan
On Oct 16, 2006, at 3:09 PM, David Fielder ((US)) wrote:
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.
David Fielder
Senior Engineer
Dimension Data
Office: (336) 510-9431
Mobile: (336) 669-5129
david.fielder at us.didata.com
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