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GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

GSM 09.02 - Version 5.3.0 - Digital cellular telecommunications - ETSI

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19.5.2 Procedures in the MSC<br />

Page 499<br />

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

The MSC procedures for interrogation are identical to those specified for registration in subclause 19.1.2.<br />

The text and diagrams in subclause 19.1.2 apply with all references to registration changed to<br />

interrogation.<br />

19.5.3 Procedures in the VLR<br />

Supplementary service interrogation<br />

When receiving the MAP_INTERROGATE_SS indication, the MAP user acts as follows:<br />

- if the operator has barred the subscriber from access to supplementary services, the error Call<br />

Barred is returned to the MSC. The parameter "operatorBarring" shall be included with the error.<br />

The interrogation is either answered by the VLR or by the HLR, depending on the service interrogated.<br />

a) Interrogation to be handled by the VLR<br />

The supplementary service request shall then be processed according to TS <strong>GSM</strong> 03.11 and the 03.8x<br />

and 03.9x-series of technical specifications. This handling may lead to either a successful result, a partially<br />

successful result, or an error being returned.<br />

For call independent SS operations, each message shall only contain a single component. Messages which<br />

contain more than one component will be stopped at the air interface (as specified in TS <strong>GSM</strong> 09.11).<br />

b) Interrogation to be handled by HLR<br />

If the interrogation is to be handled by the HLR, on receiving the MAP_INTERROGATE_SS indication, the<br />

MAP user in the VLR transfers the information to the HLR in the MAP_INTERROGATE_SS request without<br />

further checking the contents of the service indication.<br />

The VLR will receive the MAP_INTERROGATE_SS confirm from the HLR. The MAP user in the VLR shall<br />

transfer the information contained in this primitive to the MSC in the MAP_INTERROGATE_SS response<br />

without checking its contents.<br />

For call independent SS operations, each message shall only contain a single component. Messages which<br />

contain more than one component will be stopped at the air interface (as specified in TS <strong>GSM</strong> 09.11).<br />

Error handling<br />

Handling of MAP_P_ABORT, MAP_U_ABORT, MAP_NOTICE and unexpected MAP_CLOSE in this<br />

procedure is identical to the handling in the Registration procedure in the VLR, subclause 19.1.3.<br />

The Interrogation procedure is described in figure 19.5.3/1.

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