[cisco-voip] 7912/05/02 issue..

[Ryan Ratliff]

Those phones (as well as ATAs) are very susceptible to heavy  
broadcast traffic.  The best thing to do is simply reduce the amount  
of packets getting put out the switch port to the phone.  If there is  
no PC behind the phone make it an access port in the voice vlan.  If  
there is a PC then make sure only the voice and data vlans are being  
passed to the phone by the switch.   This is why having them as  
access mode with the voice vlan works best.  If your switch doesn't  
support that configuration then prune the non-voice/data vlans from  
the trunk on that port.

It's a design limitation and if you want to swap out all your older  
phones for new ones TAC isn't the right place to look.  If you can  
work out a deal with your partner/account team more power to you but  
I'm pretty sure Smartnet doesn't cover hardware upgrades.

-Ryan

On Apr 21, 2006, at 1:18 AM, Erick Bergquist wrote:

I have seen this on some networks.  Try to clean up the network as  
best as you can and reduce un-needed traffic to phones.

Also, with these model phones having the switchports going to phones  
configured as access mode with voice vlan works better then  
switchport configured as a trunk going to a phone from my run ins  
with this problem. There was a recent thread heavilly discussing the  
switchport config for phone connections.

----- Original Message ----
From: Jim McBurnett <jim at tgasolutions.com>
To: cisco-voip at puck.nether.net
Sent: Thursday, April 20, 2006 8:00:08 AM
Subject: [cisco-voip] 7912/05/02 issue..

All,
I was wondering about a specific problem I saw.

Voice quality deteriorates in 7912, 7902 and 7905 IP phones whenever
there is heavy traffic on the switch.

This was noted on a TAC Case:
http://www.ciscotaccc.com/kaidara-advisor/voice/showcase?case=K13013165

Since the 7911 has more memory and features, is it the answer to this
issue?

Anyone have a thought on this?

Tks,
Jim

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