SIP with CUBE HA

[Mike Lydick]

Has anyone deployed SBCs at 2 or more location with the design requirement to be Highly Available and preserve calls during a failure? Customer has 2 Cubes and will have 2 Verizon SIP trunks at 2 different geographical locations. Provider will use round-robin for call setup and we can similar from the CM/CUBE side. What is in question is call preservation if one cube fails. It has been recommended to use media-flow around but not sure that will give us the call preservation in a failure. What is the recommended design for this. CUBE HA appears to be limited to same segment installs and HSRP is not going to work at diverse locations for a carrier.

[Jonathan Schulenberg]

The latest CUBE release allows you to have locally redundant pairs of CUBE routers when using ISR G2 hardware. In this case you would have four routers, two at each location.

http://www.cisco.com/en/US/products/sw/voicesw/ps5640/products_configuration_example09186a0080b40d82.shtml

The next step up from that would be to use ASR hardware that can provide software/hardware redundancy in a single chassis.

A Cisco Unified SIP Proxy (CUSP) can provide CUBE load balancing but it does not address dialogs already redirected to an individual CUBE.