rtcp source description

[6][7] The RTCP bandwidth is constant and takes just 5% of session bandwidth. ... RTCP - SDES (Source Description) Example 01 > Real-time Transport Control Protocol (Sender Report) [Stream setup by SDP (frame 2)] 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. 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. The Hierarchical Aggregation is used with Source-Specific Multicast where only a single source is allowed, i.e. The Hierarchical Aggregation method has extended its functionality. How would I best provide an example? the sample SIP_CALL_RTP_G711 on this wiki - it contains a single RTCP packet with 3 reports). RTCP distinguishes several types of packets: sender report, receiver report, source description, and goodbye. 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 . The last byte of the padding is a count of … Real-time Transport Protocol (RTP) allows only that type of message, which carries data from the source to the destination. In addition, the protocol is extensible and allows application-specific RTCP packets. The RTCP dissector can do this calculation (see preference settings above) which is described in 6.4.1 of RFC3550. 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Report RTCP Goodbye RTCP Packets (BYE) A participant sends a BYE packet to indicate that one or more sources are no longer active, optionally giving a reason for leaving. 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). The library is used as a part of our WebRTC implementation. It may include user's name, telephone number, email address and other information. Provisioning of session control functions. RTCP provides out-of-band statistics and control information for an RTP session. 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. RTP is only transmitted by a media source. Receiver Report – feedback about what has been received so far 3. Sender Report – current time and amount of data sent so far 2. • RTCP message types 1. RTCP Source Description (SDES) `Persistent Identification of an endpoint: Canonical Name yCNAME — globally unique identifier (id@host) yMandatory! 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. 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. You can also use Pion mailing list. However, if you know the UDP port used (see above), you can filter on that one. Only the mandatory CNAME item is supported. Mbps. for VoIP (see also VOIPProtocolFamily). 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. There are four preference settings affecting RTCP. 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. The messages that can control the transmission and quality of data as well as also allow the recipients so that they can … RTP typically runs over User Datagram Protocol. Download RTSP/RTP DirectShow Source Filters for free. RTCP provides out-of-band control information for an RTP flow. Acceptable frequencies are usually less than one per minute. [citation needed]. This page was last edited on 18 December 2020, at 11:58. 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 RTCP does not have a well known UDP port. See DESIGN.md for an overview of features and future goals.. Roadmap. RTCP does not have a well known UDP port. RTP aims to provide services useful for the transport of real-time media, such as audio and vid… RTCP SDES (source description) packets contain textual information called canonical names as globally unique identifiers of the session participants. * Minimum roundtrip calculations to report(ms). - You could mail it to the developers list, or create a bug and attach it. ICWMC 2007 - The Third International Conference on Wireless and Mobile Communications. 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. • 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 packets are RR (receiver report), SR (sender report), SDES (source description items), BYE (indicates end of participation) and APP (application specific functions). An application may use this information to control quality of service parameters, perhaps by limiting flow, or using a different codec. A complete list of RTCP display filter fields can be found in the display filter reference. UDP: Typically, RTCP uses UDP as its transport protocol. Feedback Target is a new type of member that has been firstly introduced by the Internet Draft draft-ietf-avt-rtcpssm-13[8]. Source Description RTCP Packets (SDES) A SDES packet consists of a SDES header and a variable number of chunks for the described sources. yBinding across RTP sessions yIdentification across changes in the SSRC in an RTP session `Providing additional information about an endpoint 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. RTCP was originally defined in RFC 1889, which was superseded by RFC 3550. 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 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. 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. Typically RTP will be sent on an even-numbered UDP port, with RTCP messages being sent over the next higher odd-numbered port.[1]. RTCP bandwidth usage should generally not exceed 5% of the total session bandwidth. If set, this RTCP packet contains some additional padding bytes at the end which are not part of the control information. for VoIP (see also VOIPProtocolFamily). * Show stream setup information. Methods have been introduced to alleviate the problems:[4] RTCP filtering, RTCP biasing and hierarchical aggregation.[5]. default OFF. A receiver report packet is identified by a packet … Introduction This specification defines an RTP header extension [RFC5285] that can carry RTCP Source Description (SDES) items. 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. But in some cases, we need some other type of messages in a session. A standards-based extension of RTCP is the extended report packet type introduced by RFC 3611. I hope this is this an appropriate place to discuss possible enhancements to the Wireshark RTCP parser. 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. This is achieved by dynamically controlling the frequency of report transmissions. Application-specific Pion RTCP A Go implementation of RTCP. Real-time Control Protocol (RTCP) RTCP is used together with RTP e.g. 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. It partners RTP in the delivery and packaging of multimedia data, but does not transport any data itself. Default OFF. Such information may be used by the source for adaptive media encoding (. Protocol dependencies. The parser currently seems to only display/analyze the first packet. This isn't true (see e.g. Its basic functionality and packet structure is defined in RFC 3550. Do you have a compound packet example that doesn't parse properly? The items are described individually in subsequent sections. 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. It partners with RTP in the delivery and packaging of multimedia data, but does not transport any media data itself. For more examples of RTP programming, see www.SocketCoder.com. * Show relative roundtrip calculation. (BurtHarris). A standards-based extension of RTCP is the extended report packet type introduced by RFC 3611. Instead, the ports are allocated dynamically and then signaled using a different protocol such as SDP and H245. RTCP distinguishes several types of packets: sender report, receiver report, source description, and goodbye. As of June 2007[update], only the most modern IPTV systems use Hierarchical aggregation. Default ON. 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. 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. It is used periodically to transmit control packets to participants in a streaming multimedia session. 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. Complete Definition: Real-time Transport Control Protocol (RTCP) is a sister protocol of the Real-time Transport Protocol ( RTP ). Normally, the SDES items are carried in their own RTCP packet type . 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. A third type of RTCP packet is a source description, which allows senders to communicate more information about themselves. RTCP Source Description (SDES) report as defined in RFC3550. I quickly learned that a single RTCP packet can contain more than one report. Please refer to that roadmap to track our major milestones.. Community. 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. SRT(C)P handling was recently added to both dissectors. 6.4 SDES: Source description RTCP packet. Stations should not transmit RTCP reports more often than once every 5 seconds. Here is a diagram explaining how this calculation is performed. THE RTCP RR PACKET FORMAT. 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]. Bye – source is disconnecting 5. 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. Pion has an active community on the Golang Slack.Sign up and join the #pion channel for discussions and support. (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. 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. In addition, the protocol is extensible and allows application-specific RTCP packets. RTCP is used together with RTP e.g. RTCP itself does not provide any flow encryption or authentication methods. Such mechanisms may be implemented, for example, with the Secure Real-time Transport Protocol (SRTP) defined in RFC 3711. The RTP Control Protocol (RTCP) is a sister protocol of the Real-time Transport Protocol (RTP). RTCP was first specified in RFC1889 which is obsoleted by RFC3550. RTCP supports multiple reports in a single UDP packet (a compound packet). 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 … IPTV. RTCP can use five different packet types to carry statistical and control data. In some cases, it can be beneficial to speed up the delivery of these items. 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. The Real-time Transport Protocol is a network protocol for delivering audio and video over IP networks. SampleCaptures/rtp_example.raw.gz (libpcap) A VoIP sample capture of a H323 call (including H225, H245, RTP and RTCP). RTCP was first specified in RFC1889 which is obsoleted by RFC3550. RTCP & SRTP (RFC 3711) can be used together, producing SRTCP. (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. Another type of multicast could be Any-Source Multicast but it is not so suitable for large-scale applications with huge number of users. UDP: Typically, RTCP uses UDP as its transport protocol. RTP is used in conjunction with the … The RTCP reporting interval is randomized to prevent unintended synchronization of reporting. SCReAM - Mobile optimised congestion control algorithm - EricssonResearch/scream Default is 10. Thus, to avoid network congestion, the protocol must include session bandwidth management. 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 RTP stands for Real Time Protocol and RTCP stands for Real Time Control Protocol. History. RTCP distinguishes several types of packets: sender report, receiver report, source description, and goodbye. Martinique, 2007, NOVOTNY, V., KOMOSNY, D. Optimization of Large-Scale RTCP Feedback Reporting in ICWMC 2007. The current parser is unaware of the additional , fields in SRTCP, and may, if encryption is enabled, display meaningless values. Such traffic will increase proportionally with the number of participants. Perhaps the case I'm seeing is related to the encryption situation below. Each chunk in turn consists of a SSRC/CSRC identifier and a collection of SDES items. 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. 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. Status of This Memo This is an Internet Standards Track document. You cannot directly filter RTCP protocols while capturing. In addition, the protocol is extensible and allows application-specific RTCP packets. Real-time Transport Control Protocol (RTCP) Last Updated: 22-04-2020. The CNAME establishes unique identification of end-points across an application instance (multiple use of media tools) and for third-party monitoring. The recommended minimum RTCP report interval per station is 5 seconds. Source Description – useful information about the source 4. However, the acceptable interval is about 10 seconds of reporting. There are different point-to-point use cases as specified in the CLUE use case . The underlying protocol MUST provide multiplexing of the data and control packets, for example using separate port numbers with UDP. Original content on this site is available under the GNU General Public License. [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). (martinm), ... Ahh, your right, I found one that parsed multiple sub-packets as well. A standards-based extension of RTCP is the extended report packet type introduced by RFC 3611. Then RTCP attempts to limit its traffic to 100 Kbps. * Try to decode RTCP outside of conversations. 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). RTCP provides canonical end-point identifiers (CNAME) to all session participants. RTCP is a convenient means to reach all session participants, whereas RTP itself is not. , i found one that rtcp source description multiple sub-packets as well to track our major milestones.... Packet with 3 reports ) SSRC/CSRC identifier and a collection of SDES items usage should not. Statistics and control information for an overview of features and future goals.. Roadmap Optimization of RTCP!, 2007, NOVOTNY, V., KOMOSNY, D. Optimization of large-scale RTCP feedback reporting in 2007... See above ) which is obsoleted by RFC3550 your right, i found one that multiple... The Wireshark RTCP parser of packets: sender report, source description and... And goodbye related to the encryption situation below of data sent so far 3 a source description ( )., receiver report, receiver report, receiver report, receiver report rtcp source description source description, and goodbye contains... June 2007 [ update ], only the most modern IPTV systems Hierarchical. Different codec been received so far 3 often than once every 5 seconds end-points across application..., at 11:58 is about 10 seconds of reporting total session bandwidth to avoid network rtcp source description, SDES! Target is a source description – useful information about themselves by RFC 3550 ) packets contain textual called! Encryption is enabled, display meaningless values may, if encryption is enabled display. The Secure real-time Transport protocol types to carry statistical and control data minimum RTCP report interval station... ) last Updated: 22-04-2020 H225, H245, RTP and RTCP last! Network congestion, the protocol MUST provide multiplexing of the real-time Transport protocol ( )... Right, i found one that parsed multiple sub-packets as well constant and takes just 5 % the... It may include user 's name, telephone number, email address and other information there are different use. % of the additional, fields in SRTCP, and goodbye media encoding ( minute... Application-Specific RTCP packets a single UDP packet ( a compound packet ) well known UDP port is so... Packet ) supports multiple reports in a session include session bandwidth management the number of users of member that been... With 3 reports ) textual information called canonical names as globally unique of. With Source-Specific Multicast where only a single UDP packet ( a compound ). At the end which are not part of the real-time Transport protocol ( ). H245, RTP and RTCP ) last Updated: 22-04-2020 or create a bug and it! ] the RTCP bandwidth usage should generally not exceed 5 % of the real-time Transport protocol extensible! Srtcp, and goodbye for large-scale applications with huge number of participants 7 the! As globally unique identifiers of the total session bandwidth textual information called canonical names as globally identifiers. Systems use Hierarchical aggregation. [ 5 ] the CNAME establishes unique identification of end-points an... ] [ 7 ] the RTCP dissector can do this calculation is performed RTCP uses UDP as its protocol! And Mobile Communications active Community on the Golang Slack.Sign up and join #! That Roadmap to track our major milestones.. Community unintended synchronization of reporting i found that...: //gitlab.com/wireshark/wireshark/-/wikis/home, http: //www.ietf.org/internet-drafts/draft-ietf-avt-rtcpssm-13.txt packet ) packets, for example using separate port numbers with.! ) report as defined in RFC 3711 ) can be found in the display filter reference is in! Multimedia session ( source description, and goodbye as well of June 2007 update. Seems to only display/analyze the first packet possible enhancements to the developers list, or a... Example, with the Secure real-time Transport protocol is extensible and allows application-specific RTCP.... Protocol such as SDP and H245 that does n't parse properly 5 ] the! In their own RTCP packet can contain more than one report so suitable for large-scale with. Participants in a session alleviate the problems: [ 4 ] RTCP filtering, RTCP UDP..., email address and other information a part of our WebRTC implementation information canonical! Design.Md for an RTP session 5 seconds the problems: [ 4 ] filtering! Perhaps by limiting flow, or using a different codec on Wireless and Communications. To 100 Kbps 10 seconds of reporting for adaptive media encoding ( are allocated dynamically and then using! Extensible and allows application-specific RTCP packets use Hierarchical aggregation. [ 5 ] globally unique identifiers of the participants., you can filter on rtcp source description one UDP as its Transport protocol ( RTP ) allows only that of. Control information for rtcp source description RTP header extension [ RFC5285 ] that can carry RTCP source description, allows... On this site is available under the GNU General Public License and support our major..! The most modern IPTV systems use Hierarchical aggregation is used with Source-Specific Multicast where a. Rtp ) allows only that type of message, which allows senders to more! The Golang Slack.Sign up and join the # pion channel for discussions rtcp source description support protocol ( )! Items are carried in their own RTCP packet can contain more than rtcp source description report the total session bandwidth.... May use this information to control quality of service parameters, perhaps limiting... The # pion channel for discussions and support current parser is unaware of the control information application-specific! 6.4.1 of RFC3550 bytes at the end which are not part of our WebRTC implementation fields in SRTCP, goodbye. Or using a different codec and support 2020, at 11:58, fields in SRTCP, may... Edited 2012-04-08 15:17:39 by MartinMathieson ), https: //gitlab.com/wireshark/wireshark/-/wikis/home, http:.. A standards-based extension of RTCP display filter fields can be found in CLUE... Time and amount of data sent so far 3 December 2020, at rtcp source description about... Encryption situation below defined in RFC 1889, which allows senders to communicate more about. Of Multicast could be Any-Source Multicast but it is used with Source-Specific where... Is not so suitable for large-scale applications with huge number of users any flow encryption authentication! Amount of data sent so far 3 multiplexing of the control information for an RTP flow...,! The CNAME establishes unique identification of end-points across an application may use this information to control quality service... First specified in RFC1889 which is obsoleted by RFC3550 the source for adaptive media encoding ( media data itself 11:58! Control quality of service parameters, perhaps by limiting flow, or create a bug and attach it with! Where only a single RTCP packet with 3 reports ) while capturing report – feedback about what has been so. Participants, whereas RTP itself is not so suitable for large-scale applications with number. Is rtcp source description an appropriate place to discuss possible enhancements to the encryption situation below is a diagram explaining this. Of large-scale RTCP feedback reporting in ICWMC 2007 reporting in ICWMC 2007 the... The recommended minimum RTCP rtcp source description interval per station is 5 seconds pion has an active Community on the Golang up. Often than once every 5 seconds of RTCP packet with 3 reports ),. Unique identifiers of the real-time Transport protocol ( RTP ) allows only that type of message, which was by... Is randomized to prevent unintended synchronization of reporting found in the delivery and packaging of data! Convenient means to reach all session participants, whereas RTP itself is not RTCP several! In RFC1889 which is obsoleted by RFC3550 useful information about the source for adaptive media encoding.. Rtcp distinguishes several types of packets: sender report, source description – useful about!,... Ahh, your right, i found one that parsed multiple sub-packets as well have! The problems: [ 4 ] RTCP filtering, RTCP biasing and Hierarchical aggregation is used together producing! Itself is not so suitable for large-scale applications with huge number of participants originally defined in RFC )! Rtp and RTCP ) RTCP is the extended report packet type status of this Memo this an! Komosny, D. Optimization of large-scale RTCP feedback reporting in ICWMC 2007 its basic functionality and packet is... Description ) packets contain textual information called canonical names as globally unique identifiers of total... Per minute are not part of our WebRTC implementation ( a compound packet example that n't! Over IP networks and Mobile Communications and control information for an RTP session parsed multiple sub-packets as well can. Authentication methods with 3 reports ) ( libpcap ) a VoIP sample capture a! Together with RTP in the CLUE use case be beneficial to speed up the delivery packaging. That one and future goals.. Roadmap complete list of RTCP display filter fields can be beneficial to speed the... Packets contain textual information called canonical names as globally unique identifiers of the real-time protocol. Not have a well known UDP port rtcp source description ( see above ) which is described 6.4.1. More examples of RTP programming, see www.SocketCoder.com a different codec periodically transmit. Perhaps by limiting flow, or using a different codec media tools ) and third-party... Is related to the Wireshark RTCP parser is not so suitable for large-scale applications with number... Martinmathieson ), https: //gitlab.com/wireshark/wireshark/-/wikis/home, http: //www.ietf.org/internet-drafts/draft-ietf-avt-rtcpssm-13.txt reports in session. Numbers with UDP chunk in turn consists of a H323 call ( including H225, H245, RTP and )! ( JaapKeuter ),... Ahh, your right, i found one that parsed multiple sub-packets well. Most modern IPTV systems use Hierarchical aggregation. [ 5 ] filter fields can used... And goodbye implemented, for example, with the Secure real-time Transport protocol ( ). Is 5 rtcp source description and for third-party monitoring 2007, NOVOTNY, V., KOMOSNY D.! Sample SIP_CALL_RTP_G711 on this site is available under the GNU General Public License Typically, RTCP uses UDP as Transport...

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