The 'S13 Additional IMEI Check' feature is an MME enhancement to send additional International Mobile Equipment Identity (IMEI) check requests - Mobile Identity check Request (MICR) towards the EIR server over the S13 interface. The additional MICR will include additional information, non-standard AVPs: the Mobile Station International Subscriber Directory Number (MSISDN) and the e-UTRAN Cell Global Identifier (e-CGI). As well, the sending of the additional information will be triggered by various UE procedures (Attach, TAU, and Handover).
Use of the 'S13 Additional IMEI Check' feature is CLI controlled. By default, the Cisco MME supports the 3GPP-standard S13 interface towards an EIR server, which includes sending IMEI check requests containing the two AVPs, IMEI and IMSI, as defined in 3GPP TS 29.272 section 220.127.116.11.
For additional information about the two additional AVPs, please refer to:
MSISN, the standard Diameter AVP, is defined in section 6.3.2 of 3GPP TS 29.329.
eCGI is defined in section 7.3.117 of 3GPP TS 29.272.
No feature-specific license is required for this feature.