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The SIP response codes and corresponding reason phrases were initially defined in RFC 3261. [1] ... 503 Service Unavailable
The RFC specifies this code should be returned by teapots requested to brew coffee. [18] This HTTP status is used as an Easter egg in some websites, such as Google.com's "I'm a teapot" easter egg. [19] [20] [21] Sometimes, this status code is also used as a response to a blocked request, instead of the more appropriate 403 Forbidden. [22] [23]
The Session Initiation Protocol (SIP) is a signaling protocol used for initiating, maintaining, and terminating communication sessions that include voice, video and messaging applications. [1] SIP is used in Internet telephony, in private IP telephone systems, as well as mobile phone calling over LTE . [2]
A Session Initiation Protocol (SIP) Event Package for Conference State: August 2006: Conference call: RFC 4579 : Session Initiation Protocol (SIP) Call Control - Conferencing for User Agents: August 2006: RFC 4634 : US Secure Hash Algorithms (SHA and HMAC-SHA) July 2006: SHA-1, SHA-2: RFC 4655 : A Path Computation Element (PCE)-Based ...
The SIP URI scheme is a Uniform Resource Identifier (URI) scheme for the Session Initiation Protocol (SIP) multimedia communications protocol. A SIP address is a URI that addresses a specific telephone extension on a voice over IP system. Such a number could be a private branch exchange or an E.164 telephone number dialled through a specific ...
In the basic SIP specification, [15] only requests and final responses (i.e. 2XX response codes) are transmitted reliably, this is, they are retransmitted by the sender until the acknowledge message arrives (i.e. the corresponding response code to a request, or the ACK request corresponding to a 2XX response code). This mechanism is necessary ...
The presence information is coded in XML documents, that are carried in the bodies of the respective SIP messages. RFC 3863 and RFC 4479 describe this procedure, RFC 4480 (RPID), RFC 4481, RFC 4482 (CPID) and various drafts describe contents and formats of the presence documents.
Finish providing full citations. Every response code now has a citation, but some are just inline links to the RFC. (ticked off —me_and 15:24, 16 April 2013 (UTC)) Update the descriptions to be consistent in terms of tense ("Servers can send this…" vs "Indicates the request…" vs "Server has…" etc).