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  2. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    408 Request Timeout Couldn't find the user in time. The server could not produce a response within a suitable amount of time, for example, if it could not determine the location of the user in time. The client MAY repeat the request without modifications at any later time. [1]: §21.4.9 409 Conflict User already registered.

  3. 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.

  4. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    408 Request Timeout The server timed out waiting for the request. According to HTTP specifications: "The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time." 409 Conflict

  5. Session Description Protocol - Wikipedia

    en.wikipedia.org/wiki/Session_Description_Protocol

    If the stop time is 0 then the session is unbounded. If the start time is also zero then the session is considered permanent. Unbounded and permanent sessions are discouraged but not prohibited. Intervals can be represented with NTP times or in typed time: a value and time units (days: d, hours: h, minutes: m and seconds: s) sequence.

  6. SIMPLE (instant messaging protocol) - Wikipedia

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

    SIP defines two modes of instant messaging: The Page Mode makes use of the SIP method MESSAGE, as defined in RFC 3428. This mode establishes no sessions. The Session Mode. The Message Session Relay Protocol (RFC 4975, RFC 4976) is a text-based protocol for exchanging arbitrarily-sized content between users, at any time. An MSRP session is set ...

  7. Timeout (computing) - Wikipedia

    en.wikipedia.org/wiki/Timeout_(computing)

    A specified period of time that will be allowed to elapse in a system before a specified event is to take place, unless another specified event occurs first; in either case, the period is terminated when either event takes place. Note: A timeout condition can be canceled by the receipt of an appropriate time-out cancellation signal.

  8. Standard Interchange Protocol - Wikipedia

    en.wikipedia.org/wiki/Standard_Interchange_Protocol

    SIP is a simple protocol in which requests to perform operations are sent over a connection, and responses are sent in return. The protocol explicitly does not define how a connection between the two devices is established; it is limited to specifying the format of the messages sent over the connection. [ 4 ]

  9. SIP trunking - Wikipedia

    en.wikipedia.org/wiki/SIP_trunking

    SIP trunking is a voice over Internet Protocol (VoIP) technology and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX) and unified communications facilities. [1]