SIP - SIP Response Codes - 6xx Global Failure Responses - SIP

What are Global Failure Responses?

The responses which indicate that the request is failed is global failure response and hence the request is not sent to other locations.

The definitive knowledge server will sent a global error class response. Else, client error class response is sent.

600 Busy Everywhere

  • This response indicates that the call to the specified Request-URI could be answered in other locations.

603 Decline

  • This response could indicate the called party is busy, or simply does not want to accept the call.

604 Does Not Exist Anywhere

  • This response is similar to the 404 Not Found response but indicates that the user in the Request-URI cannot be found anywhere.
  • This response should only be sent by a server having access to all the information about the user.

606 Not Acceptable

  • This response indicates that some aspect of the desired session is not acceptable to the UAS, and as a result, the session cannot be established.
  • The response may contain a Warning header field with a numerical code describing exactly what was not acceptable.
  • The request can be retried with different media session information.

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