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[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]
RFC 3261: BYE: Signal termination of a dialog and end a call. This message may be sent by either endpoint of a dialog. RFC 3261: CANCEL: Cancel any pending request. Usually means terminating a call while it is still ringing, before answer. RFC 3261: UPDATE: Modify the state of a session without changing the state of the dialog. RFC 3311: REFER
RFC 3261 SHA hash functions: RFC 3174, RFC 4634 Simple Authentication and Security Layer: RFC 2222, RFC 4422 Simple Mail Transfer Protocol, Internet Message Format: RFC 196, RFC 772, RFC 821, RFC 822, RFC 2821, RFC 2822, RFC 5321, RFC 5322 Simple Network Management Protocol: RFC 1067, RFC 1098, RFC 1157 (v.1), RFC 1441 (v.2) RFC 2570 (v.3)
RFC 4028 — Session Timers in SIP; RFC 5626 — Managing Client-Initiated Connections in SIP (Outbound mechanism) RFC 5954 — Essential Correction for IPv6 ABNF and URI Comparison in RFC 3261; RFC 6026 — Correct Transaction Handling for 2xx Responses to SIP INVITE Requests; RFC 7118 — The WebSocket Protocol as a Transport for SIP
A SIP address is written in user@domain.tld format in a similar fashion to an email address.An address like: sip:1-999-123-4567@voip-provider.example.net. instructs a SIP client to use the NAPTR and SRV schemes to look up the SIP server associated with the DNS name voip-provider.example.net and connect to that server.
A B2BUA maintains complete state for the calls it handles. Each side of a B2BUA operates as a standard SIP user agent network element as specified in RFC 3261. In addition to call management, a B2BUA may provide billing services, internetworking for protocol conversions, and hiding of network-internal topology and information.
Control of ToIP sessions has been defined using the standard Session Initiation Protocol (SIP) (RFC 3261) and the Session Description Protocol (SDP) (RFC 4566) protocols. SIP is used without any alteration. Real-time text encoding is identified by using the SDP media definition 'm=text'.
These two extensions allow users to specify their preferences about the service the IMS provides. With the caller preferences extension, [8] the calling party is able to indicate the kind of user agent they want to reach (e.g. whether it is fixed or mobile, a voicemail or a human, personal or for business, which services it is capable to provide, or which methods it supports) and how to search ...