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NAC 3310 and Teledex Iphone LD4205S issue


Needing your help on this particular issue with Cisco NAC and Teledex Iphone LD4205S (SIP voip phone).

The setup is this, the Iphone is connected to a port on a Cisco 3750 switch. And a laptop is connected to this Iphone.

I can see that Cisco NAC correctly changed the vlan for the switch port but the laptop is not getting an IP address.

The strange thing is that when the port is not managed by the NAC, the laptop can get an IP address.

Also, when the port is manged by NAC and the laptop is directly connected to the port, the laptop can get an IP address.

It's only when the laptop is connected to the Iphone and the port is managed by the NAC...when the laptop can't get an IP address.

Any thoughts?

Thanks so much in advance...