User-Equipment-Info-ModifiedEUI64  AVP ( 657 )

There are a number of types of terminals that have identifiers other than IMEI, IEEE 802 MACs, or EUI-64. These identifiers can be converted to modified EUI-64 format as described RFC4291 or by using some other methods referred to in the service-specific documentation. The User-Equipment-Info-ModifiedEUI64 AVP contains such identifiers.
Reference: RFC 8506   View

Type:

  OctetString

Mandatory Bit:

  MAY

Protection Bit:

  MAY

Vendor ID:

  0

Value Length:

  0 .. *

Containing AVPs
User-Equipment-Info-Extension