Message and call processing used in GSM

 Message and call processing used in GSM

Diagram of massage and call processing used in GSM

1. The PSTN user dials the MSISDN of the called user in GSM.
2. The LE routes the decision to the GMSC of the called GSM user.
3. The GMSC uses the dialed MSISDN to work out the serving HLR for the GSM user and interrogates it to get the specified routing number.
4. The HLR requests the present serving VLR for the called MS for a MSRN(MS roaming number) so that the decision are often routed to the right MSC.
5. The VLR passes the MSRN to the HLR
6. The HLR passes the MSRN to the GMSC.
7. Using the MSRN, the GMSC routes the decision to the serving MSC.
8. The MSC interrogates the VLR for the present location area identity (LAI) for the MS.
9. The VLR provides the present location for the MS.
10. The MSC pages MS via the acceptable BSS. The MS responds to the page and sets up the necessary signaling links. 
11. When the BSS has established the required radio links, the MSC is informed an the decision is delivered to the MS.
12.  When the MS answers the decision , the connection is completed to the calling PSTN user.

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