From: eicc tester (reto_ccie@yahoo.com)
Date: Thu Apr 12 2007 - 15:15:46 ART
Hi,
Don4't try auto qos with Nortel Ip phones or Nortel sof-phones.
Regarding Nortel Soft-phones, it marks stream voice with "ef" like cisco, but Signaling (propietary protocol) is maket with 27 different than Cisco, I don't remember what is this moment you can see with Etherreal.
note: some packet from nortel propietary signal. protocol are not marked as signaling just dscp "0" probably those packet are not important for Nortel.
With respect softphones you can trus dscp in this port, configure trust dhcp, it work!.
Regarding Ip phones it use 802.1p, voice stream is "5", but signaling is not the same than cisco, just configure trust cos here. You have to configure the Data vlan on Nortel IP Phones, and the PC connected to IP must correspont to respective subnet in that data vlan.
if you are using especial aplication like CTI with sofphones , probably you need to use service policy for especial CTI control or database access, (use dscp 21, or 22) and after trust dscp for signaling and voice from softphone.
Good hibrid troubleshooting !
rguyler@shp-dayton.org wrote:
Anybody using Nortel IP telephony on Cisco switches? I've done several all-Cisco IPT installs but never using Nortel and unfortunately I can't find any docs on best practices for this hybrid setup, specifically the QOS differences.
According to CCO, "auto qos" is said to only work with Cisco phones but if the phones mark the packets the same way then I don't see why it would matter since the packets should be classified the same way by the switch and the switch queues used in the same manner.
The only difference I can find is that I should use the more generic "auto qos voip trust" option rather then specifying the "cisco-phone" option. Will this trust both 802.1p and DSCP values assigned by the phones? Or is it a one or the other situation?
If anybody has any thoughts or comments on this I would greatly appreciate it. Of course, I've been given almost no time before go-live to lab this up so I'm grasping for straws. ;-)
Thanks!
Rik
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