Cisco 3750 switch with Nortel phones

Unanswered Question
Aug 14th, 2009


I am trying to set up a nortel phone with a cisco switch. I have put the port in the trunk modem. The phone works but the PC attached to the phone doesnt. Please let me know what I am missing.


I have this problem too.
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George Thomas Fri, 08/14/2009 - 09:03

The config will be as follows:

switchport access vlan xx

switchport voice vlan xx

switchport trunk encapsulation dot1q

switchport mode trunk

Thanks for your response.

Jerry Ye Fri, 08/14/2009 - 09:26

Add the following command

switchport trunk native vlan yy

where yy is your data vlan.



DRAFT666 Tue, 08/18/2009 - 00:35


You don't need to manually trunk the port with Nortel phones, the

switchport voice vlan xx

will do this for you.

So you only need,

switchport access vlan

switchport mode access

switchport voice vlan

You need to make sure the Nortel phone settings for the voice and data vlan are the same, either via hardcoding in the phone options or via DHCP options 191 & 128. Have a look at this link




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