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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 ...
420 Bad Extension Bad SIP Protocol Extension used, not understood by the server. [1]: §21.4.15 421 Extension Required The server needs a specific extension not listed in the Supported header. [1]: §21.4.16 422 Session Interval Too Small The received request contains a Session-Expires header field with a duration below the minimum timer. [11]
They are both complementary to H.323 and the Session Initiation Protocol (SIP) protocols. [2] [3] H.248 was the result of collaboration of the MEGACO working group of the Internet Engineering Task Force (IETF) and the International Telecommunication Union Telecommunication Study Group 16. The IETF originally published the standard as RFC 3015 ...
SIP is distinguished by its proponents for having roots in the Internet community rather than in the telecommunications industry. SIP has been standardized primarily by the Internet Engineering Task Force (IETF), while other protocols, such as H.323, have traditionally been associated with the International Telecommunication Union (ITU).
RFC 5194 "Framework for real-time text over IP using the Session Initiation Protocol (SIP)" provides an overview of interworking issues. Work is being proposed in the IETF SIPPING work group on more detailed interworking based on a range of call scenarios.
This is a partial list of RFCs (request for comments memoranda). A Request for Comments (RFC) is a publication in a series from the principal technical development and standards-setting bodies for the Internet, most prominently the Internet Engineering Task Force (IETF).
Network-Based Call Signaling Protocol Specification (NCS) which is an MGCP extension for analog residential Media Gateways - the NCS specification, which is derived from the IETF MGCP RFC 2705, details VoIP signalling. Basically the IETF version is a subset of the NCS version. The Packet Cable group has defined more messages and features than ...
That means, the SIP transport layer must make sure that no one else can see the attachment. This can be done by using TLS transport layer, or other methods like S/MIME. Using TLS assumes that the next hop in the SIP proxy chain can be trusted and it will take care about the security requirements of the request.