Example 1

A more detailed example is when a softswitch might return a list of contacts for multiple PSTN gateways in a Redirect message. If the PSTN target number contacted on redirection is busy, a 486 response will be sent to the Oracle® Enterprise Session Border Controller. Since the single target is located in the PSTN, a subsequent request through a different gateway will yield another 486 response. The Oracle® Enterprise Session Border Controller should be configured to return the 486 response to the UAC immediately. No other SIP requests should be sent to applicable targets/contacts that were enumerated in the redirect list. See the following example: