Surrogate Agent Reregistration to SAG Member Handling

In a round-robin environment sometimes requests need to go to the same server as the initial request. The Oracle Communications Session Border Controller will direct the reREGISTER request to a 401/407 response for a surrogate agent to the same Proxy Call Session Control Function(P-CSCF) as the prior REGISTER request for security purposes.

Round robin environments are commonly implemented to balance traffic on multiple Proxy Call Session Control Functions(P-CSCFs). While this strategy is effective, it does also introduce complexity to scenarios in which some consecutive requests need to be directed to the same target. When an initial reREGISTER is challenged, the Oracle Communications Session Border Controller directs the reREGISTER request for a surrogate agent to the same Proxy Call Session Control Function(P-CSCF) as the prior REGISTER request. If the reREGISTER were to go to another server, it would never be accepted. The routing decision for this reREGISTER is made independent of local policy.

No configuration is needed to enable this feature. However, the cache-challenges parameter in the SIP Config must be enabled (default).