On a Cisco Unified Communications Manager SIP trunk with a single remote device and OPTIONS ping feature enabled, which response from the SIP remote peer causes the trunk to be marked as "Out of Service"?
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A. B. C. D. E.D.
408 Request Timeout Couldn't find the user in time.
The server could not produce a response within a suitable amount of time, for example, if it could not determine the location of the user in time.
The client MAY repeat the request without modifications at any later time References: http://en.wikipedia.org/wiki/List_of_SIP_response_codes.
When the Cisco Unified Communications Manager (CUCM) is configured with a SIP trunk, it can use the SIP OPTIONS ping feature to monitor the status of the trunk. This feature sends a periodic OPTIONS message to the remote device to check whether it is available or not. If the remote device responds to the OPTIONS message with a SIP error code, the trunk may be marked as "Out of Service."
Out of the provided answer choices, the response that will cause the SIP trunk to be marked as "Out of Service" is D. 408 Request Timeout. This response code indicates that the remote device did not respond to the OPTIONS message within a specified period, which is typically 5 seconds. When this occurs, CUCM will assume that the remote device is not available and will mark the trunk as "Out of Service."
The other answer choices, A. 401 Unauthorized, B. 505 Version Not Supported, C. 406 Not Acceptable, and E. 500 Server Internal Error, indicate different types of errors that can occur when a SIP message is sent. While these errors may affect the communication between CUCM and the remote device, they do not necessarily indicate that the remote device is not available. Therefore, they will not cause the trunk to be marked as "Out of Service" by CUCM.
In summary, the correct answer is D. 408 Request Timeout, as it indicates that the remote device did not respond to the SIP OPTIONS message, which will cause the trunk to be marked as "Out of Service" by CUCM.