Which two responses are examples of client error responses in SIP protocol? (Choose two.)
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A. B. C. D. E. F.BF.
Client Error (400 to 499)Request contains bad syntax or cannot be fulfilled at this server.
This class of 400 to 499 contains only error messages.
SIP (Session Initiation Protocol) is a signaling protocol used for initiating, modifying, and terminating multimedia sessions such as voice and video calls over IP networks. SIP responses are messages sent by a SIP server or endpoint in response to a request sent by a SIP client or another SIP server.
Client error responses are SIP responses that indicate that the client (or user agent) has made an error in the request or cannot fulfill the request. The client error responses are in the 4xx range of SIP response codes.
The correct answers are B. 404 Not Found and F. 408 Request Timeout. Here's why:
A. 302 Moved Temporarily: This is not a client error response, but a redirection response. It indicates that the requested resource has moved temporarily to a different location. The client should use the new address in subsequent requests.
B. 404 Not Found: This is a client error response that indicates that the requested resource is not found on the server. This could be because the user or device being called does not exist, or because the user or device is not registered on the server.
C. 503 Service Unavailable: This is a server error response that indicates that the server is temporarily unavailable or unable to fulfill the request. It is not a client error response.
D. 502 Bad Gateway: This is a server error response that indicates that the server received an invalid response from a upstream server while trying to fulfill the request. It is not a client error response.
E. 604 Does Not Exist Anywhere: This is a SIP response that is not part of the official SIP specification. It is used by some SIP servers to indicate that the requested user or device does not exist anywhere in the network.
F. 408 Request Timeout: This is a client error response that indicates that the client did not receive a timely response from the server. This could be because of network congestion, server overload, or other issues. The client should retry the request after a certain amount of time.
In summary, the correct answers are B. 404 Not Found and F. 408 Request Timeout, as they are both client error responses in the 4xx range of SIP response codes.