This topic was already covered here: Indentification between iBeacon & telemetry
TLDR: There isn’t a common value between iBeacon and Telemetry. Those are independent packets, configured and advertised separately. In order to match them together you need to query cloud for your devices configuration and match UUID/major/minor (broadcasted in iBeacon) with unique device ID (broadcasted in telemetry packet). There is not enough space in either iBeacon and Estimote Telemetry packets to squeeze a common id. We advice to use Proximity SDK that is based on Estimote Location packet that is using same device ID as telemetry packets (this way you don’t need to use Cloud).