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Comment: Updated per Sankar's comments.

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Failover to another SIP server will also occur if the SBC receives the following SIP response code from an active SIP server: 4xx, 5xx, or 6xx.

Note

When Load Balancing is configured as Priority: Register Active Only in the SIP Signaling Group, a SIP Failover Cause Code should be selected under Mapping Tables in the SIP Signaling Group. If a SIP Failover Cause Code is selected, Failover occurs for timeout cases and failure response codes.  If a SIP Failover Cause Code is not selected, Failover occurs only for timeout cases and not for failure response codes. 

Refer to Creating and Modifying Entries in SIP Server Tables for configuring Failover SIP Registration.

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