[cisco-voip] Nortel phones on Cisco Switch

Jason Aarons (US) jason.aarons at us.didata.com
Thu Feb 12 11:04:01 EST 2009

I can't tell you how many times I worked with TAC on "static" 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




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:



Best Regards,




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.



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