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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.
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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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