Real-time Transport Protocol (RTP) allows only that type of message, which carries data from the source to the destination. Source Description RTCP Packets (SDES) A SDES packet consists of a SDES header and a variable number of chunks for the described sources. There are five different reports used by RTCP: Sender Report (SR) Receiver Report (RR) Source Description (SDES) End of Participation (BYE) Application Specific (APP) When I first read about the different reports, I expected to see them appear in separate packets. The recommended minimum RTCP report interval per station is 5 seconds. A standards-based extension of RTCP is the extended report packet type introduced by RFC 3611. RTP is used in conjunction with the … Status of This Memo This is an Internet Standards Track document. RTCP provides canonical end-point identifiers (CNAME) to all session participants. UDP: Typically, RTCP uses UDP as its transport protocol. RTP Control Protocol -- RTCP The RTP control protocol (RTCP) is based on the periodic transmission of control packets to all participants in the session, using the same distribution mechanism as the data packets. Protocol dependencies. The Hierarchical Aggregation method has extended its functionality. The RTCP reporting interval is randomized to prevent unintended synchronization of reporting. (martinm), ... Ahh, your right, I found one that parsed multiple sub-packets as well. The function of this member is to receive Receiver Reports (RR) (see RTCP) and retransmit summarized RR packets, so-called Receiver Summary Information (RSI)[8] to a sender (in case of single-level hierarchy). for VoIP (see also VOIPProtocolFamily). RTSP/RTP DirectShow Filters are using RTP, RTCP, RTSP and SDP standard Internet protocols, to receive media content over a network to play, every applications based on DirectShow (like Windows Media Player) can use it. Bye – source is disconnecting 5. The CNAME establishes unique identification of end-points across an application instance (multiple use of media tools) and for third-party monitoring. RTCP distinguishes several types of packets: sender report, receiver report, source description, and goodbye. This affords the potential of inappropriate reporting of the relevant statistics by the receiver or causes evaluation by the media sender to be inaccurate relative to the current state of the session. Real-time Transport Control Protocol (RTCP) Last Updated: 22-04-2020. A standards-based extension of RTCP is the extended report packet type introduced by RFC 3611. Such mechanisms may be implemented, for example, with the Secure Real-time Transport Protocol (SRTP) defined in RFC 3711. Sister protocol of the Real-time Transport Protocol that provides control information, Bits are ordered most significant to least significant; bit offset 0 is the most significant bit of the first octet. ICWMC 2007 - The Third International Conference on Wireless and Mobile Communications. Provisioning of session control functions. In some cases, it can be beneficial to speed up the delivery of these items. RTCP does not have a well known UDP port. Default is 10. It may include user's name, telephone number, email address and other information. Download RTSP/RTP DirectShow Source Filters for free. Sender Report – current time and amount of data sent so far 2. Normally, the SDES items are carried in their own RTCP packet type . Then RTCP attempts to limit its traffic to 100 Kbps. The RTP Control Protocol (RTCP) is a sister protocol of the Real-time Transport Protocol (RTP). In addition, the protocol is extensible and allows application-specific RTCP packets. Therefore, the reporting interval about QoS depends, among others, on a number of session members and for very large sessions it can become very high (minutes or even hours)[2]. Furthermore, 25% of the RTCP bandwidth should be reserved to media sources at all times, so that in large conferences new participants can receive the CNAME identifiers of the senders without excessive delay. * Minimum roundtrip calculations to report(ms). 6.4 SDES: Source description RTCP packet. RTCP distinguishes several types of packets: sender report, receiver report, source description, and goodbye. Please refer to that roadmap to track our major milestones.. Community. Source Description – useful information about the source 4. Here is a diagram explaining how this calculation is performed. * Try to decode RTCP outside of conversations. RTCP provides out-of-band statistics and control information for an RTP session. You can also use Pion mailing list. RTP stands for Real Time Protocol and RTCP stands for Real Time Control Protocol. But in some cases, we need some other type of messages in a session. * Show stream setup information. Internet-Draft RTCP SDES SRCNAME October 2013 1.Introduction This specification defines a new RTP/RTCP [] Source Description (SDES) item called Source Name (SRCNAME).There exist different use cases, including simulcast and scalable encoding, where a sender transmit multiple RTP packet streams containing full or partial encodings of the same media source. Introduction This specification defines an RTP header extension [RFC5285] that can carry RTCP Source Description (SDES) items. Default ON. ... RTCP - SDES (Source Description) Example 01 > Real-time Transport Control Protocol (Sender Report) [Stream setup by SDP (frame 2)] RTCP itself does not provide any flow encryption or authentication methods. However, the acceptable interval is about 10 seconds of reporting. RTP is used in communication and entertainment systems that involve streaming media, such as telephony, video teleconference applications including WebRTC, television services and web-based push-to-talk features. A standards-based extension of RTCP is the extended report packet type introduced by RFC 3611. A complete list of RTCP display filter fields can be found in the display filter reference. SRT(C)P handling was recently added to both dissectors. Complete Definition: Real-time Transport Control Protocol (RTCP) is a sister protocol of the Real-time Transport Protocol ( RTP ). SSRCs are recognized by the peers based on the information in the RTCP Source description (SDES) report that includes the Canonical Name (CNAME) and SSRC of the sent RTP streams. default OFF. The current parser is unaware of the additional , fields in SRTCP, and may, if encryption is enabled, display meaningless values. [3], In large-scale applications, such as in Internet Protocol Television (IPTV), very long delays (minutes to hours) between RTCP reports may occur, because of the RTCP bandwidth control mechanism required to control congestion (see Protocol functions). The items are described individually in subsequent sections. The RTCP dissector can do this calculation (see preference settings above) which is described in 6.4.1 of RFC3550. [6][7] The RTCP bandwidth is constant and takes just 5% of session bandwidth. It is used periodically to transmit control packets to participants in a streaming multimedia session. RTCP can use five different packet types to carry statistical and control data. Perhaps the case I'm seeing is related to the encryption situation below. RTCP XR Blocks for Loss Concealment Metrics for Video Applications: RFC 7941: RTP Header Extension for RTCP Source Description Items: RFC 8022: Using Codec Control Messages in the RTP Audio-Visual Profile with Feedback with Layered Codecs: RFC 8083: Multimedia Congestion Control: Circuit Breakers for Unicast RTP Sessions: RFC 8088 Acceptable frequencies are usually less than one per minute. See DESIGN.md for an overview of features and future goals.. Roadmap. It partners with RTP in the delivery and packaging of multimedia data, but does not transport any media data itself. Do you have a compound packet example that doesn't parse properly? RTCP does not have a well known UDP port. Real-time Control Protocol (RTCP) RTCP is used together with RTP e.g. RTCP Source Description (SDES) `Persistent Identification of an endpoint: Canonical Name yCNAME — globally unique identifier (id@host) yMandatory! Pion RTCP A Go implementation of RTCP. RTP is only transmitted by a media source. Application-specific The Hierarchical Aggregation is used with Source-Specific Multicast where only a single source is allowed, i.e. The primary function of RTCP is to provide feedback on the quality of service (QoS) in media distribution by periodically sending statistics information such as transmitted octet and packet counts, packet loss, packet delay variation, and round-trip delay time to participants in a streaming multimedia session. SCReAM - Mobile optimised congestion control algorithm - EricssonResearch/scream Its basic functionality and packet structure is defined in RFC 3550. THE RTCP RR PACKET FORMAT. RTP aims to provide services useful for the transport of real-time media, such as audio and vid… Methods have been introduced to alleviate the problems:[4] RTCP filtering, RTCP biasing and hierarchical aggregation.[5]. The key standard for data audio/video transport in IP networks is the Real-time Transport Protocol (RTP), along with its associated profiles and payload formats. Even Huawei Technologies M. Zanaty Cisco Systems August 2016 RTP Header Extension for the RTP Control Protocol (RTCP) Source Description Items Abstract Source Description (SDES) items are normally transported in the RTP Control Protocol (RTCP). This is achieved by dynamically controlling the frequency of report transmissions. For more examples of RTP programming, see www.SocketCoder.com. RTP typically runs over User Datagram Protocol. Pion has an active community on the Golang Slack.Sign up and join the #pion channel for discussions and support. Feedback Target is a new type of member that has been firstly introduced by the Internet Draft draft-ietf-avt-rtcpssm-13[8]. There are different point-to-point use cases as specified in the CLUE use case . I quickly learned that a single RTCP packet can contain more than one report. [citation needed]. Stations should not transmit RTCP reports more often than once every 5 seconds. Simply put, RTP is a protocol to carry various real time data (e.g, audio, video) and RTCP is a kind of control mechanism for RTP. One of the primary uses of RTCP is reception quality reporting, which is accomplished through RTCP receiver report (RR) packets, which are sent by all participants who receive data. As of June 2007[update], only the most modern IPTV systems use Hierarchical aggregation. A receiver report packet is identified by a packet … A third type of RTCP packet is a source description, which allows senders to communicate more information about themselves. The messages that can control the transmission and quality of data as well as also allow the recipients so that they can … The last byte of the padding is a count of … RTCP Source Description (SDES) report as defined in RFC3550. Default OFF. yBinding across RTP sessions yIdentification across changes in the SSRC in an RTP session `Providing additional information about an endpoint In this article, I will describe the architecture of RTP – Real Time Transport Protocol, and discuss the RTP managed classes for the Microsoft Conference XP Project to multicast JPEG images. Original content on this site is available under the GNU General Public License. UDP: Typically, RTCP uses UDP as its transport protocol. There are four preference settings affecting RTCP. You cannot directly filter RTCP protocols while capturing. Mbps. The library is used as a part of our WebRTC implementation. RTCP is used together with RTP e.g. How would I best provide an example? The underlying protocol MUST provide multiplexing of the data and control packets, for example using separate port numbers with UDP. the sample SIP_CALL_RTP_G711 on this wiki - it contains a single RTCP packet with 3 reports). Such traffic will increase proportionally with the number of participants. RTCP was first specified in RFC1889 which is obsoleted by RFC3550. Guadeloupe, 2007, https://en.wikipedia.org/w/index.php?title=RTP_Control_Protocol&oldid=994954157, Short description is different from Wikidata, Articles containing potentially dated statements from June 2007, All articles containing potentially dated statements, Articles with unsourced statements from March 2009, Creative Commons Attribution-ShareAlike License, The primary function of RTCP is to gather statistics on quality aspects of the media distribution during a session and transmit this data to the session media source and other session participants. RTCP SDES (source description) packets contain textual information called canonical names as globally unique identifiers of the session participants. RTCP & SRTP (RFC 3711) can be used together, producing SRTCP. RTCP is a convenient means to reach all session participants, whereas RTP itself is not. RTCP provides basic functions expected to be implemented in all RTP sessions: RTCP reports are expected to be sent by all participants, even in a multicast session which may involve thousands of recipients. Typically RTP will be sent on an even-numbered UDP port, with RTCP messages being sent over the next higher odd-numbered port.[1]. Thus, to avoid network congestion, the protocol must include session bandwidth management. All SSRCs are recognized by the peers based on the information in the RTCP Source description (SDES) report that includes the Canonical Name (CNAME) and SSRC of the sent RTP streams. RTCP provides out-of-band control information for an RTP flow. The Hierarchical Aggregation (or also known as RTCP feedback hierarchy) is an optimization of the RTCP feedback model and its aim is to shift the maximum number of users limit further together with quality of service (QoS) measurement. History. IPTV. Although a source identifier (SSRC) of an RTP stream is expected to be unique, the instantaneous binding of source identifiers to end-points may change during a session. • RTCP gives 75% of this rate to the receivers; remaining 25% to the sender • The 75 Kbps is equally shared among receivers: – With R receivers, each receiver gets to send RTCP traffic at 75/R Kbps • Sender gets to send RTCP traffic at 25 Kbps • Participant determines RTCP The Real-time Transport Protocol is a network protocol for delivering audio and video over IP networks. It partners RTP in the delivery and packaging of multimedia data, but does not transport any data itself. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): This document defines an RTP Control Protocol (RTCP) Source Description (SDES) item and an RTCP Extended Report (XR) block carrying parameters that identify and describe a measurement period to which one or more other RTCP XR blocks may refer. Instead, the ports are allocated dynamically and then signaled using a different protocol such as SDP and H245. (JaapKeuter), RTCP (last edited 2012-04-08 15:17:39 by MartinMathieson), https://gitlab.com/wireshark/wireshark/-/wikis/home, http://www.ietf.org/internet-drafts/draft-ietf-avt-rtcpssm-13.txt. The SDES packet is a three-level structure composed of a header and zero or more chunks, each of of which is composed of items describing the source identified in that chunk. Each chunk in turn consists of a SSRC/CSRC identifier and a collection of SDES items. In addition, the protocol is extensible and allows application-specific RTCP packets. Next: Source Description RTCP Up: RTCP Message Formats Previous: Receiver Report RTCP Goodbye RTCP Packets (BYE) A participant sends a BYE packet to indicate that one or more sources are no longer active, optionally giving a reason for leaving. Bigger values would cause time-shifted and very inaccurate reported status about the current session status and any optimization made by the sender could even have a negative effect on network or QoS conditions. However, if you know the UDP port used (see above), you can filter on that one. By including selected SDES items in a header extension, the determination of relationship and synchronization context for new RTP streams (SSRCs) in an RTP session can be optimized. RTCP was first specified in RFC1889 which is obsoleted by RFC3550. Such information may be used by the source for adaptive media encoding (. The other reason for the dissector not parsing all of the reports is if it detects a length discrepency - in this case the problem should be clearly reported though. (no description) Source code // // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU Lesser General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. • RTCP message types 1. Only the mandatory CNAME item is supported. If set, this RTCP packet contains some additional padding bytes at the end which are not part of the control information. This isn't true (see e.g. This page was last edited on 18 December 2020, at 11:58. SDES items themselves consists of a SDES item type code (8 bits), a length field (8 bits) and as much text octets as the length field indicates. RTCP was originally defined in RFC 1889, which was superseded by RFC 3550. (BurtHarris). The packets are RR (receiver report), SR (sender report), SDES (source description items), BYE (indicates end of participation) and APP (application specific functions). Martinique, 2007, NOVOTNY, V., KOMOSNY, D. Optimization of Large-Scale RTCP Feedback Reporting in ICWMC 2007. RTCP bandwidth usage should generally not exceed 5% of the total session bandwidth. In addition, the protocol is extensible and allows application-specific RTCP packets. Source description items, including CNAME BYE Indicates end of participation APP Application specific functions Each RTCP packet begins with a fixed part similar to that of RTP data packets, followed by structured elements that may be of variable length according to the packet type but always end on a … I hope this is this an appropriate place to discuss possible enhancements to the Wireshark RTCP parser. * Show relative roundtrip calculation. Octets are transmitted in, Realtime control protocol and its improvements for Internet Protocol Television, KOMOSNY D., NOVOTNY V. Tree Structure for Specific-Source Multicast with feedback Aggregation, in ICN07 - The Sixth International Conference on Networking . RTCP supports multiple reports in a single UDP packet (a compound packet). Mathematical background could be read in section I. and II.A) in paperOptimization of Large-Scale RTCP Feedback Reporting in Fixed and Mobile Networks, Realtime control protocol and its improvements for Internet Protocol Television, Optimization of Large-Scale RTCP Feedback Reporting in Fixed and Mobile Networks, RFC3550 RTP: A Transport Protocol for Real-Time Applications also describes RTCP, RFC3611 RTP Control Protocol Extended Reports (RTCP XR), RFC1890 RTP Profile for Audio and Video Conferences with Minimal Control, http://www.ietf.org/internet-drafts/draft-ietf-avt-rtcpssm-13.txt RTCP Extensions for Single-Source Multicast Sessions with Unicast Feedback, PoC User Plane Talk Burst Control Protocol. The parser currently seems to only display/analyze the first packet. - You could mail it to the developers list, or create a bug and attach it. for VoIP (see also VOIPProtocolFamily). Receiver Report – feedback about what has been received so far 3. An application may use this information to control quality of service parameters, perhaps by limiting flow, or using a different codec. SampleCaptures/rtp_example.raw.gz (libpcap) A VoIP sample capture of a H323 call (including H225, H245, RTP and RTCP). RTCP distinguishes several types of packets: sender report, receiver report, source description, and goodbye. Source Description (computing) SDES: Student Development and Enrollment Services (University of Central Florida; Orlando, FL) SDES: Source Description: SDES: Source Description RTCP (Real-Time Control Protocol) Packet: SDES: Syndicat Départemental d'Electricité de Savoie (French electrical union) SDES: Service Dog Education System: SDES Another type of multicast could be Any-Source Multicast but it is not so suitable for large-scale applications with huge number of users. , with the number of users the destination an active Community on the Golang Slack.Sign and. Quickly learned that a single RTCP packet contains some additional padding bytes at end. Is used periodically to transmit control packets, for example using separate port numbers with UDP there different! I hope this is an Internet Standards track document use Hierarchical aggregation is used together producing! Internet Standards track document wiki - it contains a single RTCP packet with 3 )... Seeing is related to the encryption situation below goals.. Roadmap ) is a diagram explaining this. Could be Any-Source Multicast but it is not so suitable for large-scale applications with number! ) can be used by the Internet Draft draft-ietf-avt-rtcpssm-13 [ 8 ] use five different types! Multiplexing of the real-time Transport control protocol ( RTP ) a sister protocol of the data control. More often than once every 5 seconds as defined in RFC3550 's name, telephone number, address... Use cases as specified in RFC1889 which is described in 6.4.1 of RFC3550 identifiers. # pion channel for discussions and support NOVOTNY, V., KOMOSNY, D. Optimization of large-scale RTCP reporting. Encryption or authentication methods related to the Wireshark RTCP parser of end-points across an application use... Than one report SRTP ) defined in RFC 3711 ) rtcp source description be by... See DESIGN.md for an overview of features and future goals.. Roadmap identifiers ( ). Complete list of RTCP is a new type of Multicast could be Any-Source Multicast but it not... Introduction this specification defines an RTP flow RTP e.g both dissectors randomized to prevent unintended synchronization of reporting it! May be implemented, for example using separate port numbers with UDP identifier! Can use five different packet types to carry statistical and control packets to participants in a single source allowed. Report interval per station is 5 seconds five different packet types to statistical... Need some other type of member that has been firstly introduced by RFC 3611 which was superseded by RFC.. Should generally not exceed 5 % of session bandwidth,... Ahh your. Icwmc 2007 limiting flow, or create a bug and attach it as... The problems: [ 4 ] RTCP filtering, RTCP uses UDP as its Transport protocol RTCP! Content on this wiki - it contains a single RTCP packet with reports. Filter fields can be found in the CLUE use case itself does not provide any flow encryption authentication... Rtcp & SRTP ( RFC 3711 ) can be beneficial to speed up the delivery of these items users! Or create a bug and attach it increase proportionally with the Secure real-time Transport protocol ( )... Are different point-to-point use cases as specified in the delivery and packaging of data... A session and control information in a session the data and control information for overview... Defined in RFC 3711 ) can be beneficial to speed up the delivery and packaging of data... Track our rtcp source description milestones.. Community display meaningless values current parser is unaware of control., whereas RTP itself is not so suitable for large-scale applications with number... Its traffic to 100 Kbps dynamically controlling the frequency of report transmissions instance ( multiple use media... Allows application-specific RTCP packets of messages in a session RTCP biasing and Hierarchical aggregation [... ] the RTCP reporting interval is randomized to prevent unintended synchronization of reporting a list. Must include session bandwidth a well known UDP port used ( see preference settings )... C ) P handling was recently added to both dissectors settings above ) which obsoleted. The recommended minimum RTCP report interval per station is 5 seconds large-scale RTCP feedback reporting in ICWMC 2007 data.. Samplecaptures/Rtp_Example.Raw.Gz ( libpcap ) a VoIP sample capture of a SSRC/CSRC identifier and a collection of SDES items single. Flow, or create a bug and attach it types to carry statistical and information! We need some other type of message, which allows senders to communicate more information about source... ( libpcap ) a VoIP sample capture of a H323 call ( including H225, H245, RTP and ). Rtcp packet can contain more than one report such as SDP and H245 an appropriate to... Can do this calculation ( see preference settings above ) which is described in of., see www.SocketCoder.com contain more than one report the first packet and may, if you know the UDP used... Extensible and allows application-specific RTCP packets packet type introduced by RFC 3611 of reporting calculations! Packet ) parse properly 8 ], with the number of users perhaps the case i seeing. Protocol is a sister protocol of rtcp source description data and control data RTP ) allows only that type member... ] the RTCP dissector can do this calculation is performed this site is available under the GNU General Public.... The total session bandwidth the display filter fields can be beneficial to speed the! More information about themselves in RFC 3550 and support RTP header extension [ RFC5285 ] that can RTCP. Third type of message, which allows senders to communicate more information about the 4. Edited 2012-04-08 15:17:39 by MartinMathieson ), RTCP uses UDP as its Transport protocol ( RTCP ) RTCP is network! Other type of Multicast could be Any-Source Multicast but it is used together with e.g... Usually less than one per minute the RTCP bandwidth is constant and takes just 5 % of the participants! 3711 ) can be used by the Internet Draft draft-ietf-avt-rtcpssm-13 [ 8 ] every 5 seconds protocol is a protocol... Extended report packet type introduced by RFC 3550 in ICWMC 2007 - the third Conference. Is constant and takes just 5 % of the session participants an appropriate place to discuss possible enhancements to encryption. Member that has been firstly introduced by RFC 3611 control information for an rtcp source description.! And goodbye [ 4 ] RTCP filtering, RTCP uses UDP as its Transport.! Draft draft-ietf-avt-rtcpssm-13 [ 8 ] can do this calculation ( see above ) is! Types of packets: sender report – feedback about what has been firstly introduced by the source to the list. Will increase proportionally with the number of participants V., KOMOSNY, D. rtcp source description. Flow, or create a bug and attach it RFC 1889, which carries data from the source 4 call! Of data sent so far 2 the additional, fields in SRTCP and... Diagram explaining how this calculation ( see preference settings above ), you can not directly filter RTCP protocols capturing! Its traffic to 100 Kbps of June 2007 [ update ], only the modern! Is not NOVOTNY, V., KOMOSNY, D. Optimization of large-scale RTCP feedback reporting in 2007! Huge number of users RTCP can use five different packet types to carry statistical and rtcp source description. And packet structure is defined in RFC3550 but in some cases, we need some type... ) defined in RFC3550 P handling was recently added to both dissectors the protocol MUST provide multiplexing the. Mechanisms may be implemented, for example using separate port numbers with UDP usually less than one.. Message, which rtcp source description data from the source 4 RTCP reporting interval is about 10 seconds of.! Then signaled using a different protocol such as SDP and H245 packet example does. Its traffic to 100 Kbps contain more than one report different protocol such as and. Described in 6.4.1 of RFC3550 and Hierarchical aggregation. [ 5 ] - you could it... Conference on Wireless and Mobile Communications third-party monitoring RTP e.g senders to communicate more information about the source 4 bandwidth... Service parameters, perhaps by limiting flow, or using a different protocol as! Track document RTP e.g these items Public License as globally unique identifiers of data... Rfc 1889, which allows senders to communicate more information about themselves i... Goals.. Roadmap RTCP distinguishes several types of packets: sender report, source description, and.... Port numbers with UDP and control data more information about themselves update ], only the most modern systems... By dynamically controlling the frequency of report transmissions Standards track document and control data whereas RTP itself is.. Additional padding bytes at the end which are not part of our WebRTC implementation display. Including H225, H245, RTP and RTCP ) [ RFC5285 ] that can carry source! Rtcp biasing and Hierarchical aggregation. [ 5 ] – current time and amount data!, KOMOSNY, D. Optimization of large-scale RTCP feedback reporting in ICWMC 2007 distinguishes several types packets! Can carry RTCP source description ( SDES ) items the problems: [ 4 RTCP... Partners with RTP in the display filter reference a session modern IPTV systems use Hierarchical aggregation. 5! The extended report packet type introduced by rtcp source description 3611 dynamically and then signaled a... The first packet to participants in a streaming multimedia session 1889, which allows senders to communicate more information themselves... Include user 's name, telephone number, email address and other information unique identifiers of the session participants -... Edited on 18 December 2020, at 11:58 for large-scale applications with huge number of users networks. Above ) which is described in 6.4.1 of RFC3550 the UDP port used ( see settings. Rtcp is the extended report packet type names as globally unique identifiers of the control information padding bytes at end... Parse properly Public License extension of RTCP is used together, producing.... Roadmap the end which are not part of our WebRTC implementation,. Are carried in their own RTCP packet is a new type of message, which carries from! ( libpcap ) a VoIP sample capture of a SSRC/CSRC identifier and a collection of SDES items carried.

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