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SIP is a text-based protocol with syntax similar to that of HTTP. There are two different types of SIP messages: requests and responses. The first line of a request has a method, defining the nature of the request, and a Request-URI, indicating where the request should be sent. [19] The first line of a response has a response code.
The Session Initiation Protocol (SIP) is a signaling 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).
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 ...
Protocol Creator First public release date License Identity (not inc. alias) Asynchronous message relaying Transport Layer Security End-to-end encryption Unlimited number of contacts Bulletins to all contacts One-to-many routing [a] Spam protection Group, channel or conference support Audio/VoIP support Webcam/Video Batch file sharing
Session Initiation Protocol for Telephones (SIP-T), [42] that describes the practices and uses of these gateways. ISDN User Part (ISUP) to Session Initiation Protocol (SIP) Mapping, [43] which makes it possible to translate SIP signaling messages into ISUP messages of the Signaling System No. 7 (SS7) which is used in the PSTN, and vice versa.
The Session Description Protocol (SDP) is a format for describing multimedia communication sessions for the purposes of announcement and invitation. [1] Its predominant use is in support of streaming media applications, such as voice over IP (VoIP) and video conferencing. SDP does not deliver any media streams itself but is used between ...
In computer networking, the Message Session Relay Protocol (MSRP) is a protocol for transmitting a series of related instant messages in the context of a communications session. An application instantiates the session with the Session Description Protocol (SDP) over Session Initiation Protocol (SIP) or other rendezvous methods.
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]