[cisco-voip] 3825 Voice Gateway Issue

[Ryan Ratliff]

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





Disclaimer: This e-mail communication and any attachments may contain  
confidential and privileged information and is for use by the  
designated addressee(s) named above only. If you are not the intended  
addressee, you are hereby notified that you have received this  
communication in error and that any use or reproduction of this email  
or its contents is strictly prohibited and may be unlawful. If you  
have received this communication in error, please notify us  
immediately by replying to this message and deleting it from your  
computer. Thank you.

_______________________________________________
cisco-voip mailing list
cisco-voip at puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-voip