The Session Initiation Protocol (SIP) is a signalling protocol used for controlling communication sessions such as Voice over IP telephone calls. SIP is based on request/response transactions, in a similar manner to the Hypertext Transfer Protocol (HTTP). Each transaction consists of a SIP request (which will be one of several request methods), and at least one response.[1]: p11
SIP requests and responses may be generated by any SIP user agent; user agents are divided into clients (UACs), which initiate requests, and servers (UASes), which respond to them.[1]: §8 A single user agent may act as both UAC and UAS for different transactions:[1]: p26 for example, a SIP phone is a user agent that will be a UAC when making a call, and a UAS when receiving one. Additionally, some devices will act as both UAC and UAS for a single transaction; these are called Back-to-Back User Agents (B2BUAs).[1]: p20
SIP responses specify a three-digit integer response code, which is one of a number of defined codes that detail the status of the request. These codes are grouped according to their first digit as "provisional", "success", "redirection", "client error", "server error" or "global failure" codes, corresponding to a first digit of 1–6; these are expressed as, for example, "1xx" for provisional responses with a code of 100–199.[1]: §7.2 The SIP response codes are consistent with the HTTP response codes, although not all HTTP response codes are valid in SIP.[1]: §21
SIP responses also specify a "reason phrase", and a default reason phrase is defined with each response code.[1]: §7.2 These reason phrases can be varied, however, such as to provide additional information[1]: §21.4.18 or to provide the text in a different language.[1]: §20.3
The SIP response codes and corresponding reason phrases were initially defined in RFC 3261.[1] That RFC also defines a SIP Parameters Internet Assigned Numbers Authority (IANA) registry to allow other RFC to provide more response codes.[1]: §27 [2]
This list includes all the SIP response codes defined in IETF RFCs and registered in the SIP Parameters IANA registry as of 27 January 2023[update]. This list also includes SIP response codes defined in obsolete SIP RFCs (specifically, RFC 2543), which are therefore not registered with the IANA; these are explicitly noted as such.
SIP responses may also include an optional Warning header, containing additional details about the response. The Warning contains a separate three-digit code followed by text with more details about the warning.[1]: §20.43 The current list of official warnings is registered in the SIP Parameters IANA registry.
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and 28 Related for: List of SIP response codes information
(B2BUAs).: p20 SIPresponses specify a three-digit integer responsecode, which is one of a number of defined codes that detail the status of the request...
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numbers are fixed at eight digits for area code 02, and seven digits for area codes from 03X to 09X, with area codes fixed at one, two, or three digits (a...
user2:Realm:734418f1e487083dc153890208b79379 Session Initiation Protocol (SIP) uses basically the same digest authentication algorithm. It is specified...
primarily on the status code, and secondarily on the other response header fields. Clients may not understand all registered status codes but they must understand...
for example, in the mapping of servers and user addresses in the Session Initiation Protocol (SIP). The combination of NAPTR records with Service Records...
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a proper HTTP return code. By HTTP specifications RFC 2616, any web server returns several HTTP codes. Analysis of the HTTP codes is the fastest way to...
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communicated in the form class.code . You can find the latest CoAP request/responsecodes at [1], though the below list gives some examples: Method: 0...
RFC 3403. In the example above, the response is an address that can be reached in the Internet using the VoIP protocol SIP per RFC 3261. The terminal application...
indications in response. The protocol represents a decomposition of other VoIP models, such as H.323 and the Session Initiation Protocol (SIP), in which the...
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access to Nintendo DS users at certain McDonald's restaurants. Also, VoIP and SIP ports could be allowed to bypass the gateway to allow phones to make and...
products. See a listof implementations on the web container page. There are also other types of servlet containers such as those for SIP servlets, e.g...
standard SIP client, which then uses a data network to send and receive SIP messaging, and to send and receive RTP for the voice path. This methodology of turning...
Multimedia Subsystem (IMS) based on the Session Initiation Protocol (SIP), SIP Events, the Session Description Protocol (SDP) and the Binary Floor Control...
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