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To overcome this issue, 

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relays the first refresh REGISTER after it detects any status change in the primary SIP Server. This is controlled by introducing new flags in IP Signaling Profile (IPSP). 

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registers to the alternate SIP server immediately when Primary is down and reverts when Primary SIP server is up. The status of the servers server is detected through Address Reachability Service (ARS) blacklistthe blacklisting mechanism of PathCheck or ARS. For every switch from primary to secondary/alternate or from secondary/alternate to primary,

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queries the ERE/PSX to get the latest routing information and route refresh REGISTERs.

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Note
This feature requires Pathcheck support using OPTIONS Ping and or ARS static blacklisting to detect the reachability of a particular IP/FQDN. If both request command and IPSP flags are configured, command takes the preference over IPSP flags.

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Force PSX Query on Refresh Register

The CLI request queryPsxOnNextRefreshRegister command is used to force PSX query on subsequent refresh REGISTER. This enables new routing information configured in PSX to reflect in SBC when registrations are active for a long period of time.

Note
Any new registrations that are received after the command is executed are not affected by this command

The CLI request command syntax is :

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