1. Essentials Guide
  2. ENUM Based Oracle Communications Unified Session Manager
  3. Update to ENUM Database on Endpoint Connection Loss
  4. Unreachability Determination

Unreachability Determination

There are four ways that the Oracle Communications Unified Session Manager determines endpoint is not reachable:

  • No CRLF message is returned to the Oracle Communications Unified Session Manager within the expected time frame: this is based on the Oracle USM’s RFC5626 support.
  • No TCP Keepalive is returned to the Oracle Communications Unified Session Manager within the expected timeframe. This is based on configuring the network parameter configuration element per application interface.
  • The endpoint explicitly terminates its transport-layer connection to the Oracle Communications Unified Session Manager.
  • The endpoint is otherwise labeled as unreachable from a non-explicit fault condition for a call made to an unreachable endpoint.