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19.2 TRANSACTIONS FOR REGISTRATION AND AUTHENTICATION 583Figure 19.2-1. Registration procedures.On receipt of REGNOT, HLR first checks whether it has a record for a mobileidentified by MIN. If so, it checks whether the mobile is qualified to receiveservice and—if this is the case—authorizes the invoking MSC to serve the MSfor a certain authorization period. The regnot return-result includes the authorizationperiod and, if requested in REGNOT, the service profile of MS.MSC-A or MSC-B and VLR receive the regnot and establish a temporary recordwith the authorization period and service profile of MS.While processing REGNOT, HLR also updates its record, by entering theMSCID of MSC-A or VLR-P. The new serving MSC now has the informationnecessary to process calls for MS, and HLR has updated its information on thewhereabouts of MS.