NAC issues with Nortel VoIP phones

[baldwintm]

I am doing pre-production testing of the Cisco NAC (Network Access Control). This works great with my company laptops with the NAC agent installed.
We have Nortel VoIP phones.
Most of the time, NAC works great on the laptop behind the Nortel phone. (laptop is on data vlan, phone uses voice vlan)
The problem is when I make a call with the voip phone, the switch send a bunch of 'mac learned' SNMP traps to the NAC, which causes the data vlan to flap between the corporate vlan and the AUTH vlan.

This only happens during the call. It seems to start after the call is established, not when the reciever is lifted nor during dialing.

There is a checkbox in NAC that will basically only allow one MAC per switch port, but that is disabled in my setup.

Why is this happening? How can I fix it?
If you need more information, I will be glad to provide it.

 

[baldwintm]

Found the issue.

Had to add the mac address of the phone to the exception list, then I had to check the box to apply the exception list to the profile.