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  2. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    404 Not Found The server has definitive information that the user does not exist at the domain specified in the Request-URI. This status is also returned if the domain in the Request-URI does not match any of the domains handled by the recipient of the request. [1]: §21.4.5 405 Method Not Allowed

  3. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    This code is also typically used if the request provided authentication by answering the WWW-Authenticate header field challenge, but the server did not accept that authentication. The request should not be repeated. 404 Not Found The requested resource could not be found but may be available in the future.

  4. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

    Microsoft's IIS 7.0, IIS 7.5, and IIS 8.0 servers define the following HTTP substatus codes to indicate a more specific cause of a 404 error: 404.0 – Not found. 404.1 – Site Not Found. 404.2 – ISAPI or CGI restriction. 404.3 – MIME type restriction. 404.4 – No handler configured. 404.5 – Denied by request filtering configuration.

  5. Hyper Text Coffee Pot Control Protocol - Wikipedia

    en.wikipedia.org/wiki/Hyper_Text_Coffee_Pot...

    The status code 418 is sometimes returned by servers when blocking a request, instead of the more appropriate 403 Forbidden, [21] or 404 Not Found. [22] Around the time of the 2022 Russian invasion of Ukraine, the Russian military website mil.ru returned the HTTP 418 status code when accessed from outside of Russia as a DDoS attack protection ...

  6. Session Initiation Protocol - Wikipedia

    en.wikipedia.org/wiki/Session_Initiation_Protocol

    SIP employs design elements similar to the HTTP request and response transaction model. [12] Each transaction consists of a client request that invokes a particular method or function on the server and at least one response. SIP reuses most of the header fields, encoding rules and status codes of HTTP, providing a readable text-based format.

  7. SIMPLE (instant messaging protocol) - Wikipedia

    en.wikipedia.org/wiki/SIMPLE_(instant_messaging...

    SIMPLE applies SIP to the problems of: registering for presence information and receiving notifications when such events occur, for example when a user logs in or comes back from lunch; sending short messages, analogous to SMS or two-way paging;

  8. 404 - Wikipedia

    en.wikipedia.org/wiki/404

    Area code 404, a telephone area in Atlanta; Section 404 of the 2002 Sarbanes–Oxley Act; Room 404 – The Wrong Man, the second room in the 1995 film Four Rooms "404", a song by Ram Jam from the 1977 album Ram Jam "404", a 2018 song by Error

  9. SIP URI scheme - Wikipedia

    en.wikipedia.org/wiki/SIP_URI_scheme

    A SIP address is written in user@domain.tld format in a similar fashion to an email address.An address like: sip:1-999-123-4567@voip-provider.example.net. instructs a SIP client to use the NAPTR and SRV schemes to look up the SIP server associated with the DNS name voip-provider.example.net and connect to that server.