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Wednesday, March 16, 2016

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What is Server Failure (5xx) Response?

Leke Oyetoke - Wednesday, March 16, 2016

What is Server Failure (5xx) Response?

This response is used to show that the request cannot be processed because of an error with the server. The server failed to execute an apparently valid request. The response may include a Retry-After header field. The request can be tried at other locations because there are no errors specified in the request. Some of the main server failure responses are discussed below.

1. 500 Server Internal Error


a. 500 Server internal error shows that the server has experienced some kind of error that is keeping it from processing the request.

b. It is one kind of server failure that shows the client to retry the request again at this server after several seconds.

2. 501 Not Implemented

a. It shows that the server is unable to process the request because it is not supported or confirmed.

b. This response can be used to reject a request holding an unknown method.

3. 502 Bad Gateway
a. This response is sent by a proxy that is acting and playing the role as a gateway to another network.

b. It shows some problem in the other network which is preventing the request from being processed.

4. 503 Service Unavailable

a. This response shows that the requested service is temporarily unavailable at that time or moment.

b. The request can be retried or resend after a few seconds, or after the expiration of the Retry-After header field.

5. 504 Gateway Timeout

a. This response comes when the request unsuccessful due to a timeout occurred in the other network to which the gateway connects.

b. It is a server error class response because the call is failing due to a failure of the server in accessing resources outside the SIP network.

6. 505 Version Not Supported

a. The server declines a request when it comes with a different SIP version number. The denial is specified in this message.

b. Presently SIP version 2.0 is the only version implemented.

7. 513 Message Too Large

a. This response is used by a UAS to show that the request size was too large for it to process.

8. 580 Preconditions Failure

a. This response is used to disallow an SDP offer in which required preconditions


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