SIP - SIP Response Codes - 5xx Server Failure Responses - SIP

What are Server Failure responses?

The request cannot be processed fu to some server errors by using Server failure responses. A header field Retry-After may be included in the Server Failure responses.

Some of the Server Failure Responses are as follows:

500 Server Internal Error

  • 500indicates that the server has experienced some kind of error that is preventing it from processing the request.
  • It is one kind of server failure that indicates the client to retry the request again at this server after several seconds.

501 Not Implemented

  • It indicates that the server is unable to process the request because it is not supported.
  • This response can be used to decline a request containing an unknown method.

502 Bad Gateway

  • This response is sent by a proxy that is acting as a gateway to another network.
  • It indicates some problem in the other network is preventing the request from being processed.

503 Service Unavailable

  • This response indicates that the requested service is temporarily unavailable at that time.
  • The request can be retried after a few seconds, or after the expiration of the Retry-After header field.

504 Gateway Timeout

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

505 Version Not Supported

  • The server denies a request when it comes with a different SIP version number. The denial is indicated in this message.
  • Currently SIP version 2.0 is the only version implemented.

513 Message Too Large

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

580 Preconditions Failure

  • This response is used to reject an SDP offer in which required preconditions cannot be met.

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