2025-03-28 Registry closed; see , Section 3 The RFC "RTP Profile for Audio and Video Conferences with Minimal Control" specifies an initial set "payload types". This list maintains and extends that list. 0 PCMU A 8000 1 1 Reserved 2 Reserved 3 GSM A 8000 1 4 G723 A 8000 1 5 DVI4 A 8000 1 6 DVI4 A 16000 1 7 LPC A 8000 1 8 PCMA A 8000 1 9 G722 A 8000 1 10 L16 A 44100 2 11 L16 A 44100 1 12 QCELP A 8000 1 13 CN A 8000 1 14 MPA A 90000 15 G728 A 8000 1 16 DVI4 A 11025 1 17 DVI4 A 22050 1 18 G729 A 8000 1 19 Reserved A 20 Unassigned A 21 Unassigned A 22 Unassigned A 23 Unassigned A 24 Unassigned V 25 CelB V 90000 26 JPEG V 90000 27 Unassigned V 28 nv V 90000 29 Unassigned V 30 Unassigned V 31 H261 V 90000 32 MPV V 90000 33 MP2T AV 90000 34 H263 V 90000 35-71 Unassigned ? 72-76 Reserved for RTCP conflict avoidance 77-95 Unassigned ? 96-127 dynamic ? Registry closed In addition to the RTP payload formats (encodings) listed in the RTP Payload Types table, there are additional payload formats that do not have static RTP payload types assigned but instead use dynamic payload type number assignment. Each payload format is named by a registered media subtype as listed in the following table. As new payload formats are specified, their registered media subtypes should be added to this table. In addition, for the payload formats listed in the RTP Payload Types table above, the "encoding name" is also registered as a media subtype under the media type "audio" or "video". The clock rate and number of channels shown here are the normal values for those payload formats that have a normal value. Both type and subtype names are case-insensitive as defined in . This registry has been closed; it was considered redundant because all RTP payload formats are part of the . See for further details. It was previously stated that registration procedures and a registration template can be found in . As documented in , this is not the case. application 1d-interleaved-parityfec application flexfec application h224 4800 application parityfec application raptorfec application rtx application smpte336m application ulpfec audio 1d-interleaved-parityfec audio 32kadpcm 8000 audio ac3 audio AMR 8000 audio AMR-WB 16000 audio amr-wb+ 72000 audio aptx audio ATRAC-ADVANCED-LOSSLESS audio atrac-x audio atrac3 44100 audio BV16 8000 audio BV32 16000 audio clearmode 8000 1 audio CN audio DAT12 audio dsr-es201108 audio dsr-es202050 8000 audio dsr-es202211 8000 audio dsr-es202212 8000 audio DV audio DVI4 audio eac3 audio EVRC 8000 1 audio EVRC0 8000 1 audio EVRC1 8000 1 audio EVRCB 8000 1 audio EVRCB0 8000 1 audio EVRCB1 8000 1 audio EVRCNW 16000 audio EVRCNW0 16000 audio EVRCNW1 16000 audio EVRCWB audio EVRCWB0 audio EVRCWB1 audio flexfec audio fwdred audio G711-0 audio g719 48000 audio G722 audio G7221 16000 1 audio G723 audio G726-16 8000 1 audio G726-24 8000 1 audio G726-32 8000 1 audio G726-40 8000 1 audio G728 audio G729 audio G7291 16000 audio G729D 8000 1 audio G729E 8000 1 audio GSM audio GSM-EFR 8000 1 audio GSM-HR-08 8000 audio iLBC 8000 audio ip-mr_v2.5 16000 audio L8 audio L16 audio L20 audio L24 audio LPC audio MELP 8000 1 audio MELP600 8000 1 audio MELP1200 8000 1 audio MELP2400 8000 1 audio MP4A-LATM audio MPA 90000 audio mpa-robust 90000 audio mpeg4-generic audio opus 48000 audio parityfec audio PCMA audio PCMA-WB 16000 audio PCMU audio PCMU-WB 16000 audio QCELP audio raptorfec audio RED audio rtp-midi audio rtx audio scip 8000 1 audio SMV 8000 1 audio SMV0 8000 1 audio speex audio t140c audio t38 audio telephone-event audio tone audio TSVCIS 8000 1 audio uemclip audio ulpfec audio VDVI 1 audio VMR-WB 16000 audio vorbis audio vorbis-config text 1d-interleaved-parityfec text flexfec text fwdred text parityfec text raptorfec text red 1000 text rtx text t140 1000 text ttml+xml text ulpfec video BMPEG 90000 video 1d-interleaved-parityfec video 3gpp-tt video AV1 90000 AV1-Media-Type video BT656 90000 video celB video DV 90000 video EVC 90000 video flexfec video H261 video H263 90000 video H263-1998 90000 video H263-2000 90000 video H264 video H264-RCDO 90000 video H264-SVC video HEVC 90000 video JPEG video JPEG2000 video jxsv 90000 video MP1S 90000 video MP2P 90000 video MP2T video MP4V-ES 90000 video mpeg4-generic video MPV video nv video parityfec video pointer 90000 video raptorfec video raw 90000 video rtx video scip 90000 1 video smpte291 video SMPTE292M video ulpfec video vc1 90000 video vc2 90000 video VP8 90000 video VP9 90000 video VVC 90000 Magnus Westerlund The RFC "RTP: A Transport Protocol for Real-Time Applications" specifies an initial set of "control packet types" for RTCP. This list maintains and extends that list. 1-191 Specification Required or Expert Review 194-199 Specification Required or Expert Review If 200-223 is fully occupied 200-223 Specification Required or Expert Review Primary Assignments range 224-254 Specification Required or Expert Review 0 Reserved 1-191 Unassigned 192 Reserved (Historic-FIR) 193 Reserved (Historic-NACK) 194 SMPTETC SMPTE time-code mapping 195 IJ Extended inter-arrival jitter report 196-199 Unassigned 200 SR sender report 201 RR receiver report 202 SDES source description 203 BYE goodbye 204 APP application-defined 205 RTPFB Generic RTP Feedback 206 PSFB Payload-specific 207 XR extended report 208 AVB AVB RTCP packet IEEE 1733-2011 Standard for Layer 3 Transport Protocol for Time-Sensitive Applications in Local Area Networks 209 RSI Receiver Summary Information 210 TOKEN Port Mapping 211 IDMS IDMS Settings 212 RGRS Reporting Group Reporting Sources 213 SNM Splicing Notification Message 214-254 Unassigned 255 Reserved Specification Required or Expert Review Magnus Westerlund The RFC "RTP: A Transport Protocol for Real-Time Applications" specifies an initial set of "item types" for the RTCP SDES control packet. This list maintains and extends that list. 0 END end of SDES list 1 CNAME canonical name 2 NAME user name 3 EMAIL user's electronic mail address 4 PHONE user's phone number 5 LOC geographic user location 6 TOOL name of application or tool 7 NOTE notice about the source 8 PRIV private extensions 9 H323-CADDR H.323 callable address 10 APSI Application Specific Identifier 11 RGRP Reporting Group Identifier 12 RtpStreamId RTP Stream Identifier 13 RepairedRtpStreamId Repaired RTP Stream Identifier 14 CCID CLUE CaptId 15 MID Media Identification 16-255 Unassigned IETF Review 0 Reserved 1 Port Mapping Request 2 Port Mapping Response 3 Token Verification Request 4 Token Verification Failure 5-30 Unassigned 31 Reserved Standards Action or Expert Review Unassigned RTP/AVP RTP/SAVP RTP/AVPF RTP/SAVPF Specification Required Magnus Westerlund, Roni Even 1 Generic NACK Generic negative acknowledgement 2 Reserved 3 TMMBR Temporary Maximum Media Stream Bit Rate Request 4 TMMBN Temporary Maximum Media Stream Bit Rate Notification 5 RTCP-SR-REQ RTCP Rapid Resynchronisation Request 6 RAMS Rapid Acquisition of Multicast Sessions 7 TLLEI Transport-Layer Third-Party Loss Early Indication 8 RTCP-ECN-FB RTCP ECN Feedback 9 PAUSE-RESUME Media Pause/Resume 10 DBI Delay Budget Information (DBI) 3GPP TS 26.114 v16.3.0 11 CCFB RTP Congestion Control Feedback 12-30 Unassigned 31 Extension Reserved for future extensions Specification Required Magnus Westerlund, Roni Even 1 PLI Picture Loss Indication 2 SLI Slice Loss Indication 3 RPSI Reference Picture Selection Indication 4 FIR Full Intra Request Command 5 TSTR Temporal-Spatial Trade-off Request 6 TSTN Temporal-Spatial Trade-off Notification 7 VBCM Video Back Channel Message 8 PSLEI Payload-Specific Third-Party Loss Early Indication 9 ROI Video region-of-interest (ROI) 3GPP TS 26.114 v16.3.0 10 LRR Layer Refresh Request Command 11 VP Viewport (VP) 3GPP TS 26.114 12-14 Unassigned 15 AFB Application Layer Feedback 16-30 Unassigned 31 Extension Reserved for future extensions Expert Review Magnus Westerlund For extensions defined in RFCs, the URI is recommended to be of the form urn:ietf:params:rtp-hdrext:, and the formal reference is the RFC number of the RFC documenting the extension. urn:ietf:params:rtp-hdrext:toffset Transmission Time offsets urn:ietf:params:rtp-hdrext:smpte-tc SMPTE time-code mapping urn:ietf:params:rtp-hdrext:ntp-64 Synchronisation metadata: 64-bit timestamp format IETF Audio/Video Transport Working Group urn:ietf:params:rtp-hdrext:ntp-56 Synchronisation metadata: 56-bit timestamp format IETF Audio/Video Transport Working Group urn:ietf:params:rtp-hdrext:ssrc-audio-level Audio Level urn:ietf:params:rtp-hdrext:csrc-audio-level Mixer-to-client audio level indicators urn:ietf:params:rtp-hdrext:encrypt Encrypted extension header element urn:3gpp:video-orientation Coordination of video orientation (CVO) feature, see clause 6.2.3 3GPP TS 26.114, version 12.5.0 urn:3gpp:video-orientation:6 Higher granularity (6-bit) coordination of video orientation (CVO) feature, see clause 6.2.3 3GPP TS 26.114, version 12.5.0 urn:3gpp:roi-sent Signalling of the arbitrary region-of-interest (ROI) information for the sent video, see clause 6.2.3.4 3GPP TS 26.114, version 13.1.0 urn:3gpp:predefined-roi-sent Signalling of the predefined region-of-interest (ROI) information for the sent video, see clause 6.2.3.4 3GPP TS 26.114, version 13.1.0 urn:ietf:params:rtp-hdrext:sdes Reserved as base URN for RTCP SDES items that are also defined as RTP compact header extensions. Authors of urn:ietf:params:rtp-hdrext:splicing-interval Splicing Interval urn:ietf:params:rtp-hdrext:framemarking Frame marking information for video streams Expert Review Magnus Westerlund urn:ietf:params:rtp-hdrext:sdes:cname Source Description: Canonical End-Point Identifier (SDES CNAME) Authors of urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id RTP Stream Identifier urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id RTP Repaired Stream Identifier urn:ietf:params:rtp-hdrext:sdes:CaptId CLUE CaptId urn:ietf:params:rtp-hdrext:sdes:mid Media identification Specification Required Unassigned 0 IPv4 Address IPv4 Feedback Target Address 1 IPv6 Address IPv6 Feedback Target Address 2 DNS Name DNS Name indicating Feedback Target Address 3 Reserved Reserved for Assignment by Standards Action 4 Loss Loss distribution 5 Jitter Jitter distribution 6 RTT Round-trip time distribution 7 Cumulative loss Cumulative loss distribution 8 Collisions SSRC Collision list 9 Reserved Reserved for Assignment by Standards Action 10 Stats General statistics 11 RTCP BW RTCP Bandwidth indication 12 Group Info RTCP Group and Average Packet size Specification Required Unassigned 0 Reserved 1 RAMS Request 2 RAMS Information 3 RAMS Termination 4-254 Unassigned 255 Reserved Specification Required Unassigned 0 Reserved 1 Requested Media Sender SSRC(s) 2 Min RAMS Buffer Fill Requirement 3 Max RAMS Buffer Fill Requirement 4 Max Receive Bitrate 5 Request for Preamble Only 6 Supported Enterprise Number(s) 7-30 Unassigned 31 Media Sender SSRC 32 RTP Seqnum of the First Packet 33 Earliest Multicast Join Time 34 Burst Duration 35 Max Transmit Bitrate 36-60 Unassigned 61 Extended RTP Seqnum of First Multicast Packet 62-127 Unassigned 128-254 Reserved for Private Use 255 Reserved Specification Required Unassigned New response codes should be classified following the guidelines below: 1xx Informational 2xx Success 3xx Redirection 4xx RTP Receiver (RTP_Rx) Error 5xx Burst/Retransmission Source (BRS) Error 0 A private response code is included in the message 100 Parameter update for RAMS session 200 RAMS request has been accepted 201 Unicast burst has been completed 400 Invalid RAMS-R message syntax 401 Invalid min buffer requirement in RAMS-R message 402 Invalid max buffer requirement in RAMS-R message 403 Insufficient max bitrate requirement in RAMS-R message 404 Invalid RAMS-T message syntax 405 Invalid Token 500 An unspecified BRS internal error has occurred 501 BRS has insufficient bandwidth to start RAMS session 502 Burst is terminated due to network congestion 503 BRS has insufficient CPU cycles to start RAMS session 504 RAMS functionality is not available on BRS 505 RAMS functionality is not available for RTP_Rx 506 RAMS functionality is not available for the requested multicast stream 507 BRS has no valid starting point available for the requested multicast stream 508 BRS has no reference information available for the requested multicast stream 509 BRS has no RTP stream matching the requested SSRC 510 RAMS request to acquire the entire session has been denied 511 Only the preamble information is sent 512 RAMS request has been denied due to a policy Specification Required Unassigned 0 Short 1 Unassigned 2 Full 3-254 Unassigned 255 Reserved Specification Required Unassigned 0 AESKW128 1 AESKW256 2-254 Unassigned 255 Reserved Adam Roach mailto:adam&nostrum.com 2016-10-20 Chunrong Zhu mailto:Chunrong_Zhu&ccm.jf.intel.com 1996-06 Daniel Hanson mailto:dan.hanson&gd-ms.com 2021-03-15 Emil Ivov mailto:emcho&jitsi.org 2011-12 IESG mailto:iesg&ietf.org Jinwei Xia mailto:xiajinwei&huawei.com 2016-08-09 Jonathan Lennox mailto:jonathan&vidyo.com 2013-02-12 Joseph Di Pol mailto:Joe.Dipol&eng.sun.com 1996-05 Michael Faller mailto:michael.faller&gd-ms.com 2021-03-15 Mo Zanaty mailto:mzanaty&cisco.com 2024-03-18 Ozgur Oyman mailto:ozgur.oyman&intel.com 2019-11-06 Roni Even mailto:ron.even.tlv&gmail.com 2017-03-03 SCIP Working Group mailto:ncia.cis3&ncia.nato.int 2021-03-15 Unkown mailto:singer&apple.com 3GPP Specifications Manager mailto:3gppContact&etsi.org 2015-09-16 Thomas Schierl mailto:ts&thomas-schierl.de Vineet Kumar mailto:Vineet_Kumar&ccm.jf.intel.com 1997-01