Mitel sx-200 User Manual

3. If you still can’t find the problem, call Mitel Technical Support. 

• Is the problem with the local or remote subnet?

• DHCP server(s) settings

• Layer 2 switch configuration and settings

• Router configuration and settings

• Network Diagram

• IP addressing scheme

• VLAN configuration and settings

Invalid VLAN ID

DHCP Option not set 
correctly.

1. Identify the location of DHCP server and 

which DHCP server is assigned IP 

address for the corresponding subnet.

2. For an external Microsoft DHCP server 

(NT server, etc.), make sure that the 

option type is set to LONG.

3. For a Cisco Router DHCP server, make 

sure that the option type is set to hex, 

and padded with 0s (for example, 

0x00000002 for VLAN 2).

4. For the controller internal DHCP server, 

set the option type to numeric.

Duplicated IP

Existing data device 
owns the IP address.

1. Check the IP address on the phone 

display.

2. Disconnect the IP Phone.
3. From a PC on the same subnet, ping 

the suspected IP Phone. If there is a 
response, identify the data device, and 
resolve the conflict.

Corrupted DHCP 
server.

On the suspected DHCP server, disable 
then recreate the scope. If this is a 
Microsoft DHCP server, reboot the server.

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