[cisco-voip] 3825 Voice Gateway Issue

Mon Oct 16 17:58:19 EDT 2006

David Fielder

Senior Engineer

Dimension Data

Office: (336) 510-9431

Mobile: (336) 669-5129

david.fielder at us.didata.com

________________________________

From: Nikola Stojsin [mailto:nikola at worldnet.att.net] 
Sent: Monday, October 16, 2006 5:45 PM
To: David Fielder (US)
Cc: cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] 3825 Voice Gateway Issue

Two quick questions -

1. Can you please verify that the PVDM-2s in the 3825 work fine? (I
remember seeing something similar on a router with a PVDM issue.)

2. Can you post your router configuration - it would definitely help.

HTH, 

Nikola

---------------------------
Nikola Stojsin
PhD CCIE #12888
Nikola at att.net
(917) 558-1423
---------------------------

________________________________

From: cisco-voip-bounces at puck.nether.net on behalf of David Fielder (US)
Sent: Mon 10/16/2006 4:23 PM
To: Ryan Ratliff
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] 3825 Voice Gateway Issue

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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