[cisco-voip] 3825 Voice Gateway Issue

Mon Oct 16 21:08:46 EDT 2006

On the router, during a call is active, is the IP address under 'show call active voice brief' reachable from the MGCP interface on the router that MGCP is bound to and vice versa? Does that output show tx/rx traffic counts incrementing?  With MGCP all the information may not be displayed for that command, but the IP address and tx/rx counts will be there. 

Also check the phones web page during an active connected phone call, the stream page and see what IP's it is showing for the stream and verify reachibility of the path from phone to the remote device (the gateway in this case).

Also, from the config , mgcp bind commands are set for the gigabit ethernet but loopback has description on it as being MGCP interface. May not be a issue since you are troubleshooting this issue, etc and probably made changes while figuring this out but just in case you have routing/ACLs/etc set up for that and not the other interfaces, etc.

May want to do a 'debug mgcp pack' during call setup to see if setup/audio-cutover is correct and all packets are making it to gateway, etc. Are there any routing, firewalls, or QoS policies that may be effecting the call flow past this gateway? There are no drops on the QoS policies?

The 'service mgcpapp' commands are not needed on the pots dial-peers for PRI ports. In older cisco docs this was the practice but then there was a bug id on how that effected MGCP PRI backhauls and caused problems so now they say do not put that command on pots dial-peers for PRI ports. There are some conflicting docs out there on this still.

Is this the only site having this issue, other sites working fine if there are others?  What version CCM and phone firmwares?

What did you upgrade the IOS to? I see the config posted is 12.3(14)T5 but the current in that stream is 12.3(14)T7.

-- Erick

----- Original Message ----
From: David Fielder (US) <David.Fielder at us.didata.com>
To: nikola at att.net
Cc: cisco-voip at puck.nether.net
Sent: Monday, October 16, 2006 4:58:19 PM
Subject: Re: [cisco-voip] 3825 Voice Gateway Issue

Re: [cisco-voip] 3825 Voice Gateway Issue

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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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