UAS Returns Errors

422 Session Interval Too Small—The Oracle® Enterprise Session Border Controller in response sends the request again with new values in the 'Session-Expires' header field based on the 'Min-SE' value present in the 422 response.

421 Extension Required for 'timer'—This response can only happen if none of the other three entities (UAC, ingress SIP interface and egress SIP interface) support session timers. The 421 is forwarded through the system to the original UAC.

420 Bad Extension for 'timer'—This response should never happen because the Oracle® Enterprise Session Border Controller will never send Require: timer header. But the event this error is received, it will be forwarded to the original UAC.