iTel often required the MAC address of the phone because it uniquely identifies which phone you are referring to.
- Turn over the phone to look at the label on the bottom
- Look for a 12-character code made up of letters and numbers. This is the MAC address.
Aastra phone MAC addresses always start with 00085D...
Polycom phone MAC addresses always start with 0004F2...
If need be, see Determine the Make and Model of a Phone