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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]
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 ...
503: Bad sequence of commands. 504: Command not implemented for that parameter. 530: Not logged in. 532: Need account for storing files. 533: Command protection level denied for policy reasons. 534: Request denied for policy reasons. 535: Failed security check. 536: Data protection level not supported by security mechanism. 537
The hotels were among the most squalid buildings in the city, racking up hundreds of code violations. Slattery’s company managed a particularly notorious example, the Brooklyn Arms, a once-lavish hotel across from the Brooklyn Academy of Music that had deteriorated into a ramshackle blight on the neighborhood.
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 ...
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