![]() (Optionally the SUPI can be included in the query as well, to lock an IMSI to an IMEI, which is a requirement in some jurisdictions)Īs we saw in the above script, the AMF queries the EIR using the N5g-eir_EquipmentIdentit圜heck service. ![]() ![]() The dialog goes something like this: AMF: Hey EIR, can PEI 49-015420-323751-8 connect to the network?ĮIR: (checks if 49-015420-323751-8 in forbidden list - It's not) Yes. In reality these forbidden-lists are typically either country specific or carrier specific, meaning if the phone is used in a different country, or in some cases a different carrier, the phone’s IMEI is not in the forbidden-list of the overseas operator and can be freely used. The PEI is the IMEI of a phone / device, with the idea being that stolen phones IMEIs are added to a forbidden list on the EIR, and prohibited from connecting to the network, making them useless, in turn making stolen phones harder to resell, deterring mobile phone theft. The purpose of the EIR is very simple – When a subscriber connects to the network it’s Permanent Equipment Identifier (PEI) can be queried against an EIR to determine if that device should be allowed onto the network or not. Today, we’re going to look at one of the simplest Service Based Interfaces in the 5G Core, the Equipment Identity Register (EIR).
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