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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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Page 560<br />

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

20.2.3 Procedure in the interworking MSC<br />

This procedure applies only when the IWMSC is not the servicing MSC.<br />

When receiving a MAP_OPEN indication primitive that is not associated with any MAP service indication<br />

primitive and if the dialogue is accepted, the MAP service-user in the interworking MSC issues a<br />

MAP_DELIMITER request primitive in order to trigger the local MAP service-provider to confirm the<br />

dialogue. Then a MAP_FORWARD_SHORT_MESSAGE indication shall be received.<br />

When a MAP_FORWARD_SHORT_MESSAGE indication is correctly received, the Interworking MSC<br />

invokes forwarding of the short message to the Service Centre. If invalid data content is detected, an<br />

unexpected data value error or a data missing error is returned to the servicing MSC.<br />

The outcome of the procedure with the Service Centre is awaited before a<br />

MAP_FORWARD_SHORT_MESSAGE response is given back to the servicing MSC:<br />

- if a short message is accepted by the Service Centre, an acknowledgement is sent back to the<br />

servicing MSC;<br />

- if the Service Centre is not identified, the SM Delivery Failure error is returned to the servicing MSC;<br />

- if the Service Centre returns an error indication, the SM Delivery Failure error is returned to the<br />

servicing MSC with the error cause and any diagnostic information received from the Service<br />

Centre;<br />

- if the short message cannot be forwarded to the Service Centre or the procedure towards the<br />

Service Centre fails for some reason, a system failure error is sent to the servicing MSC.<br />

The mobile originated short message service transfer in the IWMSC is shown in figure 20.2/4.

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