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Content for  TR 23.820  Word version:  9.0.0

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5  Service Interruption scenariosp. 8

6  Alternative solutionsp. 17

6.1  Backup of S-CSCF Information in the HSSp. 17

6.2  Triggering of initial registration from the S-CSCF or P-CSCFp. 25

6.2A  Precautionary de-registration of un-registered usersp. 28

6.2B  S-CSCF re-assignment for unregistered userp. 28

6.3  Second P-CSCF and deregistration from S-CSCFp. 28

6.4  Monitoring P-CSCF Healthp. 31

6.5  Possible Solution for SIP-AS Service Restorationp. 34

6.6  Update of S-CSCF Name in the HSS after Loss of Datap. 35

6.7  Forking Service Restorationp. 37

6.8  Possible Solutions for SIP-AS Service Restorationp. 38

6.9  AS Behaviour After HSS Recoveryp. 39

6.10  HSS Failover with no loss of servicep. 40

7  Conclusions and recommendationsp. 41

$  Change historyp. 13


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