[cisco-voip] Nortel phones on Cisco Switch

[Chris Ward]

Just to help clarify that point, phones use DSPs to convert the packetized
voice to an analog stream. The phone load contains the DSP firmware which
phone loads can fix static issues caused by the DSP. But again, the phone
DSP is an analog issue, not a QoS issue.

Chris Ward 


From: "Jason Aarons (US)" <jason.aarons at us.didata.com>
Date: Thu, 12 Feb 2009 11:04:01 -0500
To: Thomas Dupas <thomas at dupas.be>, Morgan Andreas
<morgan.andreas at gmail.com>, <cisco-voip at puck.nether.net>
Subject: Re: [cisco-voip] Nortel phones on Cisco Switch

I can¹t tell you how many times I worked with TAC on ³static² and it was
never the 2-wire to 4-wire or any kind of impendence problem! Yet that is
the first thing they say (they must be reading too many books).
 
With a 7940 static noise is a problem with the phone load.
 
 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Thomas Dupas
Sent: Thursday, February 12, 2009 10:57 AM
To: Morgan Andreas; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Nortel phones on Cisco Swtich
 

Hi,

 

First of all, static noise looks like an impedance problem/mismatch on the
PSTN/pots side, and not like a QoS problem.

 

But anyway, the QoS setup would be similar to Cisco phones:

- I assume the phone will send out 802.1p/dscp markings

   - if so you need to configure the switch to trust those markings

  - if not you need to define a policy to match that traffic (based on the
incoming port, ip, protocol or ...) and mark it yourself

- you need to assign those markings to the (hw-)queues of your choice on the
interface on the switches

- you need to define LLQ on the routers to assign priority bandwidth to
those packets/markings

 

the following url will explain all the steps in detail:

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/1
2.2_35_se/configuration/guide/swqos.html

 

Best Regards,

 

Thomas


Van: cisco-voip-bounces at puck.nether.net [cisco-voip-bounces at puck.nether.net]
namens Morgan Andreas [morgan.andreas at gmail.com]
Verzonden: donderdag 12 februari 2009 16:48
Aan: cisco-voip at puck.nether.net
Onderwerp: [cisco-voip] Nortel phones on Cisco Swtich

I have a Nortel BCM200 phone system w/ I2002 & I2004 phones. We are needing
to configure QOS on the 3560Gs they have in place for their Nortel phones.
They are currently complaining of static on all the phone lines including
their intercom system (thru the Nortel phone system). We have them Vlan'd
out (voice/data) but not sure of the commands to enable the QOS on switch
for the phones. Does anyone happen to have any incite as to what needs to be
done in order to enable the QOS for these phones? Any help would be
appreciated.

Thanks


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