Many of the manufacturers support this option 82, which allows us to create a DHCP reservation for our customers using the mac address of our inventory, rather than the mac address of the customer’s wireless router. Here’s a snippet from another manufacturer’s user guide that does support this feature.
When working with an external DHCP server, EPC/ PGW acts as a DHCP Client and
Relay Agent and optionally enables configuration of DHCP Option 82 (including suboption
6 with UE subscription identity – IMSI).