EIR List Determination

The EIR list determination algorithm is the same for both SS7/Sigtran and Diameter.

Whitelist Processing

Indicates the IMEI is valid and registration should be allowed for this MS/UE (User equipment).

If the EIR Global Response configuration option is set (with the eirgrsp parameter) to a value other than off, the IMEI is treated as being on the list indicated by the EIR Global Response option, regardless of the actual status of the IMEI. No list logic processing is performed on the IMEI.

If the EIR Global Response option is set to off, the individual IMEIs are searched first.

If no match is found, the range IMEIs are searched next. If the IMEI is found only on the Whitelist after either search, the list logic processing is complete, and the Whitelist status of the IMEI is sent to the MSC.

Blacklist Processing

Indicates the IMEI is invalid and registration should not be allowed for this MS/UE (User equipment).

If the IMEI is found on the Blacklist after either search, list logic processing continues based on the EIR response type, set by the eirrsptype parameter of the chg-gsmopts command. If the EIR response type is type 3, and the IMEI is not also found on the Whitelist, the status of the IMEI is unknown.

If the IMEI is also found on the Whitelist, or if the EIR response type is either type 1 or 2, the value of the IMSI Check option, set with the eirimsichk parameter of the chg-gsmopts command, is checked. If the IMSI check option is on, and the IMSI is present in the message, the RTDB is searched for the IMSI. If there is a match for the IMSI, the status of the IMEI is determined to be “White with Override.” If there is no match for the IMSI, the status of the IMEI is determined to be “Black with IMSI Match Failed.” If the value of the IMSI Check option is off, the status of the IMEI is determined to be "on the Blacklist".

Graylist Processing

Indicates the IMEI is questionable. Registration should be allowed, but the MS/UE should be tracked.

If the IMEI is found on the Graylist after either search, list logic processing continues based on the EIR response type. If the EIR response type is type 3, and the IMEI is not also found on the White List, the status of the IMEI is unknown.

If the IMEI is also found on the Whitelist, or if the EIR response type is either type 1 or 2, the status of the IMEI is determined to be on the Graylist.