H3C Technologies H3C SecPath F1000-E - Manual (Page 40)

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• Sub-option 4: Failover route that specifies the destination IP address and the called number that a
Session Initiation Protocol (SIP) user uses to reach another SIP user when both the primary and
backup calling processors are unreachable.
NOTE:
You must define the sub-option 1 to make other sub-options effective.
Protocols and Standards
• RFC 2131: Dynamic Host Configuration Protocol
• RFC 2132: DHCP Options and BOOTP Vendor Extensions
• RFC 1542: Clarifications and Extensions for the Bootstrap Protocol
• RFC 3046: DHCP Relay Agent Information Option