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A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP)", (2004)

by M Westerlund
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SDP: session description protocol

by M. Handley, V. Jacobson, C. Perkins , 1998
"... This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards " (STD 1) for the standardization state and status of this pro ..."
Abstract - Cited by 186 (1 self) - Add to MetaCart
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards " (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2006). This memo defines the Session Description Protocol (SDP). SDP is intended for describing multimedia sessions for the purposes of session announcement, session invitation, and other forms of multimedia session initiation.
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...type> is an alphanumeric modifier giving the meaning of the <bandwidth> figure. Two values are defined in this specification, but other values MAY be registered in the future (see Section 8 and [21], =-=[25]-=-): CT If the bandwidth of a session or media in a session is different from the bandwidth implicit from the scope, a "b=CT:..." line SHOULD be supplied for the session giving the proposed upper limit ...

A hitchhiker’s guide to the Session Initiation Protocol (SIP). IETF Network Working Group Request for Comments 5411

by J Rosenberg , 2009
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...al applicability for sending large instant messages, but has yet to find much actual use. RFC 3890, A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP) (S): RFC 3890 =-=[89]-=- specifies an SDP extension that allows for the description of the bandwidth for a media session that is independent of the underlying transport mechanism. It has seen relatively little usage. RFC XXX...

SDP Security Descriptions for Media Streams

by F. Andreasen, M. Baugher, D. Wing, Cisco Systems - Work in Progress , 2003
"... This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards " (STD 1) for the standardization state and status of this pro ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the &quot;Internet Official Protocol Standards &quot; (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2006). This document defines a Session Description Protocol (SDP) cryptographic attribute for unicast media streams. The attribute describes a cryptographic key and other parameters that serve to configure security for a unicast media stream in either a single message or a roundtrip exchange. The attribute can be used with a variety of SDP media transports, and this document defines how to use it for the Secure Real-time Transport Protocol (SRTP) unicast media
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...his window should be to work satisfactorily (e.g., based on sender knowledge of the number of packets per second). However, there might be enough information given in SDP attributes like "a=maxprate" =-=[maxprate]-=- and the bandwidth modifiers to allow a receiver to derive the parameter satisfactorily. Consequently, this value is only considered a hint to the receiver of the SDP that MAY choose to ignore the val...

TOC A Framework for SDP Attributes when Multiplexing

by S. Nandakumar , 2013
"... draft-nandakumar-mmusic-sdp-mux-attributes-02 The Session Description Protocol (SDP) provides mechanisms to describe attributes of multimedia sessions and of individual media streams (e.g., Real-time Transport Protocol (RTP) sessions) within a multimedia session. In the RTCWeb WG, there is a need to ..."
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draft-nandakumar-mmusic-sdp-mux-attributes-02 The Session Description Protocol (SDP) provides mechanisms to describe attributes of multimedia sessions and of individual media streams (e.g., Real-time Transport Protocol (RTP) sessions) within a multimedia session. In the RTCWeb WG, there is a need to use a single 5-tuple for sending and receiving media associated with multiple media descriptions (&quot;m= &quot; lines). Such a requirement has raised concerns over the semantic implications of the SDP attributes associated with the RTP Sessions multiplexed over a single transport layer flow. The scope of this specification is to provide a framework for analyzing the multiplexing characteristics of SDP attributes. The specification also categorizes existing attributes based on the framework described herein. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and

Status of This Memo SDP: Session Description Protocol

by C. Perkins
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...type> is an alphanumeric modifier giving the meaning of the <bandwidth> figure. Two values are defined in this specification, but other values MAY be registered in the future (see Section 8 and [21], =-=[25]-=-): CT If the bandwidth of a session or media in a session is different from the bandwidth implicit from the scope, a &quot;b=CT:...&quot; line SHOULD be supplied for the session giving the proposed upper limit ...

Security Descriptions for Media Streams

by unknown authors
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...his window should be to work satisfactorily (e.g., based on sender knowledge of the number of packets per second). However, there might be enough information given in SDP attributes like &quot;a=maxprate&quot; =-=[maxprate]-=- and the bandwidth modifiers to allow a receiver to derive the parameter satisfactorily. Consequently, this value is only considered a hint to the receiver of the SDP that MAY choose to ignore the val...

Provisions Relating to IETF Documents

by M. Westerlund, P. Frojdh, Multimedia Broadcast/multicast Service
"... The Packet-switched Streaming Service (PSS) and the Multimedia Broadcast/Multicast Service (MBMS) defined by 3GPP use the Session Description Protocol (SDP) and Real Time Streaming Protocol (RTSP) with some extensions. This document provides information about these extensions and registers the RTSP ..."
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The Packet-switched Streaming Service (PSS) and the Multimedia Broadcast/Multicast Service (MBMS) defined by 3GPP use the Session Description Protocol (SDP) and Real Time Streaming Protocol (RTSP) with some extensions. This document provides information about these extensions and registers the RTSP and SDP extensions with IANA. Status of This Memo This document is not an Internet Standards Track specification; it is published for informational purposes. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see Section 2 of RFC 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at
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...ferent attributes that can be specified hierarchically with a top and a lower level. 3GPP Release 6 supports grouping based on bit-rate, according to the SDP bandwidth modifiers AS [RFC4566] and TIAS =-=[RFC3890]-=-, and language. The SDP attributes (see Sections 5.3.3.3 and 5.3.3.4 of [PSS-234]) are: o The media-level attribute "a=alt:<id>:<SDP-Line>" carries any SDP line and an alternative identifier. o The me...

Copyright Notice

by C. Perkins, M. Westerlund
"... Multiplexing RTP Data and Control Packets on a Single Port This memo discusses issues that arise when multiplexing RTP data packets and RTP Control Protocol (RTCP) packets on a single UDP port. It updates RFC 3550 and RFC 3551 to describe when such multiplexing is and is not appropriate, and it expl ..."
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Multiplexing RTP Data and Control Packets on a Single Port This memo discusses issues that arise when multiplexing RTP data packets and RTP Control Protocol (RTCP) packets on a single UDP port. It updates RFC 3550 and RFC 3551 to describe when such multiplexing is and is not appropriate, and it explains how the Session Description Protocol (SDP) can be used to signal multiplexed sessions. Status of This Memo This is an Internet Standards Track document. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the
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...ferent attributes that can be specified hierarchically with a top and a lower level. 3GPP Release 6 supports grouping based on bit-rate, according to the SDP bandwidth modifiers AS [RFC4566] and TIAS =-=[RFC3890]-=-, and language. The SDP attributes (see Sections 5.3.3.3 and 5.3.3.4 of [PSS-234]) are: o The media-level attribute "a=alt:<id>:<SDP-Line>" carries any SDP line and an alternative identifier. o The me...

Request for Comments: 5411

by J. Rosenberg , 2009
"... This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. The Session Initiation Protocol (SIP) is the subject of numerous specifications that have been produced by the IETF. It can be difficult to locate ..."
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This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. The Session Initiation Protocol (SIP) is the subject of numerous specifications that have been produced by the IETF. It can be difficult to locate the right document, or even to determine the set of Request for Comments (RFC) about SIP. This specification serves as a guide to the SIP RFC series. It lists a current snapshot of the specifications under the SIP umbrella, briefly summarizes each, and groups them into categories.

Real-time resource availability signaling in IP multimedia subsystem networks

by T Ozcelebi , I Radovanovic , D Sengupta
"... ABSTRACT IP Multimedia Subsystem (IMS) ..."
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ABSTRACT IP Multimedia Subsystem (IMS)
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...ntaxscauses a huge amount of overhead in delivering IMGsmetadata over the network and SDP can carry only assmall subset of IMG metadata in practical cases (e.g. codec type).sThe bandwidth modifier of =-=[16]-=- notifies the receivingsend-device on the maximum media codec rate to be usedsand the communication bit-rate required for the bit stream.sThus, [16] aims to convey bit-rate information only, without c...

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