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RFC 3261: INVITE: Initiate a dialog for establishing a call. The request is sent by a user agent client to a user agent server. When sent during an established dialog (reinvite) it modifies the sessions, for example placing a call on hold. RFC 3261: ACK: Confirm that an entity has received a final response to an INVITE request. RFC 3261: BYE
Request body in a format not supported. [1]: §21.4.13 416 Unsupported URI Scheme Request-URI is unknown to the server. [1]: §21.4.14 417 Unknown Resource-Priority There was a resource-priority option tag, but no Resource-Priority header. [10] 420 Bad Extension Bad SIP Protocol Extension used, not understood by the server. [1]: §21.4.15
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)
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.
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 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.
The RFC series contains three sub-series for IETF RFCs: BCP, FYI, and STD. Best Current Practice (BCP) is a sub-series of mandatory IETF RFCs not on standards track. For Your Information (FYI) is a sub-series of informational RFCs promoted by the IETF as specified in RFC 1150 (FYI 1). In 2011, RFC 6360 obsoleted FYI 1 and concluded this sub-series.
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 ...