[AIX HP-UX Linux Solaris Windows]This topic applies only on the i5/OS operating system.

SIP high availability

SIP uses the high availability features in WebSphere Application Server to offer a comprehensive high availability (HA) solution.

The SIP in WebSphere HA solution is described in the following topics:

SIP HA architectural considerations

SIP proxy configuration considerations

Core groups and Distribution and Consistency Services (DCS)

A core group is a set of processes which establish a high-availability domain to monitor and replicate state to one another. Each core group member communicates with one another through DCS. DCS handles elections, quorums, and heartbeats (virtual or TCP keepalive). DCS communicates with its peers via either Multicast/TCP or Reliable Multicast/UDP.

The core group coordinator is elected by quorum. The default order can be changed. The core group coordinator:
  • Maintains all group information – group name, group members, the policy of the group, and the state of each group member
  • Assigns singleton service to group members and handles failover of singleton services.

For more information on core groups, see Core groups (high availability domains)

DCS failure detection

DCS failure detection includes:
  • Active failure detection – a tunable heartbeat mechanism monitoring:
    • Time between heartbeats
    • Heartbeats lost before declaring failure
  • TCP KEEP_ALIVE / Sockets closing
  • Looking at hardware assist features



Subtopics
Replicating SIP sessions
[AIX HP-UX Linux Solaris Windows] [iSeries] SIP session affinity and failover
Upgrading SIP applications
SIP cluster routing
SIP IP sprayer
SIP load balancer
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Using Session Initiation Protocol to provide multimedia and interactive services
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Last updated: Feb 19, 2011 5:25:36 AM CST
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