10.12.2012 Views

GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Page 642<br />

<strong>GSM</strong> <strong>09.02</strong> <strong>Version</strong> <strong>5.3.0</strong>: August 1996<br />

21.6.5 Macro Obtain_IMEI_VLR<br />

This macro is used by the VLR to obtain the IMEI from the MSC, e.g. to enable handling of emergency<br />

calls in case of authentication failure (in which case the IMEI may be used by some operators as an<br />

alternative to the IMSI). It proceeds as follows:<br />

- the MAP_OBTAIN_IMEI service request is sent to the MSC, including only the Invoke Id;<br />

- the VLR then waits for the response from the MSC;<br />

- if the IMEI is received in the MAP_OBTAIN_IMEI service response, the macro terminates at the<br />

"OK" exit;<br />

- if the System Failure error is reported in the MAP_OBTAIN_IMEI service response, the "Error" exit<br />

is used;<br />

- if the MSC terminates the dialogue using a MAP_P_ABORT, MAP_U_ABORT, MAP_CLOSE or<br />

MAP_NOTICE service indication, the necessary connections are released, and the "Aborted" exit is<br />

used for termination of the macro.<br />

The macro is shown in figure 21.6/5.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!