[cisco-voip] Silence with Nortel integration

[Richard Humphries]

Bill,

Were you able to find a resolution to this issue?  I'm having the same issue with 7942 phones being on a Catalyst 4510 switch, all phones are on the same VLAN just as yours and they will drop the call one way and if they wait long enough the call comes back.

Thanks, 

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Bill
Sent: Monday, May 17, 2010 8:36 AM
To: 'Nick Matthews'
Cc: 'cisco-voip voyp list'
Subject: Re: [cisco-voip] Silence with Nortel integration

Can anyone else jump on board with this? This is happening more and more but
it is only this single site. I don't think it is layer 3 because they are
all on the same subnet. What logs can I look at and turn on? 



-----Original Message-----
From: matthn at gmail.com [mailto:matthn at gmail.com] On Behalf Of Nick Matthews
Sent: Thursday, May 13, 2010 1:55 PM
To: Bill
Cc: Jason Aarons (US); cisco-voip voyp list
Subject: Re: [cisco-voip] Silence with Nortel integration

I would check your layer2/layer3.  Specific suspicion on anything with
redundancy.  Something like a HSRP address flapping mac's, or equal
cost paths that maybe going up or down, NAT, etc.  My guess is that a
MAC address is flapping for an address in your topology somewhere.
DSPs normally don't stop and start working mid-call, they generally
choose one or the other.

-nick

On Thu, May 13, 2010 at 2:16 PM, Bill <bill at hitechconnection.net> wrote:
> Ok so this issue has come up again. It now appears, much to my dismay that
> it is not only with the Nortel integration. I have had complaints on other
> calls including IP phone to IP phone. The IP Phones are on the same
network,
> same VLAN and even the same switch. It is a 4510 switch that is fully
> loaded. I only have about 100 IP phones it now the rest are data
> connections.  It almost seems like an IP routing issue because the call
only
> drops one way and it eventually comes back as long as no one hangs up.
>
>
>
> ________________________________
>
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Bill
> Sent: Wednesday, April 28, 2010 3:25 PM
> To: 'Jason Aarons (US)'; 'cisco-voip voyp list'
> Subject: Re: [cisco-voip] Silence with Nortel integration
>
>
>
> All other H.323 calls to this gateway work fine. Only when going over the
> PRI that is connected to the Nortel. As much as I would like to point the
> finger there I need some very hard evidence to go that route.
>
>
>
> ________________________________
>
> From: Jason Aarons (US) [mailto:jason.aarons at us.didata.com]
> Sent: Wednesday, April 28, 2010 3:21 PM
> To: Bill; 'cisco-voip voyp list'
> Subject: RE: [cisco-voip] Silence with Nortel integration
>
>
>
> I'd get a sniffer up on 3845s Ethernet port and watch the H225/H245
> packets.  Got another H323 endpoint you could test with to narrow down
it's
> a Nortel issue?
>
> ________________________________
>
> From: cisco-voip-bounces at puck.nether.net
> [cisco-voip-bounces at puck.nether.net] On Behalf Of Bill
> [bill at hitechconnection.net]
> Sent: Wednesday, April 28, 2010 4:08 PM
> To: 'cisco-voip voyp list'
> Subject: [cisco-voip] Silence with Nortel integration
>
> I have a 3845 configured as an h.323 gateway. I have four PRI's connected
to
> this gateway from the PSTN. I also have a single PRI connected to this
same
> gateway used as a tie line to a Nortel system. I have had no complaints on
> calls going or coming from the PSTN. I have had several complaints on
calls
> to and from the Nortel box. The call could be setup fine and you are
talking
> but the call basically goes silent for about 10 - 15 seconds. The call
does
> not drop only silence. Also if you stay on the call the audio starts up
> again. I don't think it is an IP routing issue because calls to the PSTN
> work correctly and calls do work to the Nortel it just will stop for a few
> seconds. There are no slips and no errors on the line.
>
>
>
>
>
>
>
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