![]() When a Teams user makes an outbound call, the Direct Routing interface sends an SIP INVITE message to the SBC. Error message: Forbidden Call rejected.Consider changing the failover timer to 20 seconds in these regions or on all Direct Routing trunks. This error usually occurs in regions that have long PSTN setup times. Investigate why the SBC didn't send a response to the invitation within the configured time-out value as defined by FailoverTimeSeconds. This response code is generated by the Microsoft Teams service. If the SBC doesn't reply within the time-out value that's configured in Teams, the call is dropped. Failover timer expired on an outbound call. ![]() The response can't be produced within an acceptable amount of time. 500001 408 Gateway (SBC) failover timer expiredĮrror message: Gateway (SBC) failover timer expired This section lists combinations of Microsoft and SIP response codes, the corresponding error messages, a detailed description, and actions that you can take. For example, if the Microsoft response code is 560403, this indicates that the final response code is generated by the SBC, and the last three digits represent the SIP response code (403). All other response codes are generated by Microsoft. It might be equivalent to the SIP response code.Īny Microsoft response code that starts at 560 is generated by the SBC. is the module-specific or source-specific code.is the module-specific source or protocol.All other values of indicate that a Microsoft module generated the final response code. If is 6, this indicates that the SBC generated the final response code. represents the module that generates the response code.The structure of a Microsoft response code is as follows: These response codes are reported in the Microsoft Teams admin center and the Power BI Quality of Experience Report (QER) for PSTN. For example, the certificate on the SBC expired. This code is usually six digits long, but it might be reported as 0 digits or more than six digits, depending on the problem. Microsoft response code (CallEndSubReason): A response code that's assigned by Microsoft.The SIP response codes are defined in RFC 3261. For example, the SBC didn't reply in a timely manner. This code is received from the Session Border Controller (SBC) or Direct Routing SIP interface. SIP response code (CallEndReason): A three-digit response code that shows the request status.When you troubleshoot Direct Routing issues, the specific cause of a call failure can be identified through a combination of the following response codes:
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