With Alternate Routing Enabled
When you enable H.323 Alternate Routing on your Oracle® Enterprise Session Border Controller, you enable the use of the other next hops in addition to the first one. The retry, when the other available next hops are used, is transparent to the caller. However, the number of retries is limited by the value you set for the ACLI connect-tmo parameter, and this feature works only if there is more than one matching local policy next hop. If there is not more than one match, even if that match is a session agent group, then the call is only attempted once and the caller must retry it.
If the Oracle® Enterprise Session Border Controller receives a Release Complete message before it receives an Alerting message, then it will try the next hop if there are multiple matches. When there is no more than one match, or if the timer or number of retries is exceeded, the Oracle® Enterprise Session Border Controller proxies the most recently received Release Complete message back to the caller.
The following table shows the cause codes and release complete reasons, and either of the two actions the Oracle® Enterprise Session Border Controller takes:
- Recur—Means that the Oracle® Enterprise Session Border Controller performs (or continues to perform) alternate routing
- Proxy—Means that alternate routing stops, and the
Oracle® Enterprise Session Border Controller sends a release complete message back to the caller
H.323 Release Complete Reason Q.850 Cause Code Action No Bandwidth 34—No circuit available Recur Gatekeeper Resources 47—Resource unavailable Recur Unreachable Destination 3—No route to destination Recur Destination Rejection 16—Normal call clearing Proxy Invalid Revision 88—Incompatible destination Recur No Permission 111—Interworking, unspecified Recur Unreachable Gatekeeper 38—Network out of order Recur Gateway Resources 42—Switching equipment congestion Recur Bad Format Address 28—Invalid number format Recur Adaptive Busy 41—Temporary Failure Recur In Conference 17—User busy Proxy Undefined Reason 31—Normal, unspecified Recur Facility Call Deflection 16—Normal, call clearing Proxy Security Denied 31—Normal, unspecified Recur Called Party Not Registered 20—Subscriber absent Recur Caller Not Registered 31—Normal, unspecified Recur New Connection Needed 47—Resource Unavailable Recur Non Standard Reason 127—Interworking, unspecified Recur Replace With Conference Invite 31—Normal, unspecified Recur Generic Data Reason 31—Normal, unspecified Recur Needed Feature Not Supported 31—Normal, unspecified Recur Tunnelled Signaling Rejected 127—Interworking, unspecified Recur
