Mitel 3300 Technician's Handbook page 330

3300 ICP Technician's Handbook
Using an MXe or AX ICP
Figure 133: MXe-based Typical Voice and Data Network
Note:The AX controller does not have a built in Internet Gateway like the
MXe does. The Internet Gateway features supported on the MXe, such as
firewall, routing, NAT and remote routing, are not available on the AX
controller.
Programming of VLANs on the AX differs from the CXi/CXi II and the MXe.
On the AX, the 4 least significant bits must be unique for all VLANs.
This means that If VLAN 1 is already in use for the default data VLAN, then
the voice VLAN cannot be VLAN 1, 17, 33, 49 or so on. If you try to
program a non-valid VLAN, ESM will display a warning.
In the case where VLAN 1 is used for the data VLAN, the allowable VLAN
values for voice exclude numbers where the least significant 4 bits are the
same as VLAN 1. These values are 1 + n * 16, where n is 1 to 255.
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