Exchanging user and/or equipment-specific data between user devices, service provider involves using first data field to identify if user and/or equipment-specific data are provided in further fields

摘要

The method involves using a first data field for an identifier of whether user and/or equipment(1)-specific data are provided and a further data field(s) for user and/or equipment-specific data when the first data field identifies that user and/or equipment-specific data are provided. The further data field(s) can contain at least one of equipment manufacturer or group association information, equipment serial number or user identification.