Internet Assigned Numbers Authority
Session Description Protocol (SDP) Parameters
Created
2001-06-15
Last Updated
2025-03-28
Available Formats
[IMG]
XML [IMG]
HTML [IMG]
Plain text
Registries included below
??media
??proto
??bwtype
??nettype
??addrtype
??enckey
??attribute-name (formerly "att-field")
??content SDP Parameters
??Semantics for the "group" SDP Attribute
??"rtcp-fb" Attribute Values
??"ack" and "nack" Attribute Values
??"depend" SDP Attribute Values
??"cs-correlation" Attribute Values
??Semantics for the "ssrc-group" SDP Attribute
??SDP/RTSP key management protocol identifiers
??Codec Control Messages
??QoS Mechanism Tokens
??SDP Capability Negotiation Option Tags
??SDP Capability Negotiation Configuration Parameters Registry
??Timestamp Reference Clock Source Parameters
??Media Clock Source Parameters
??Multiplexing Categories
??association-usage Name Registry
??RID Attribute Parameters
??Candidate Attribute Extensions
media
Registration Procedure(s)
Standards Action
Reference
[RFC8866]
Available Formats
[IMG]
CSV
Type SDP Name Reference
media audio [RFC8866]
media video [RFC8866]
media text [RFC8866]
media application [RFC8866]
media message [RFC8866]
media image [RFC6466]
proto
Registration Procedure(s)
RFC Required
Reference
[RFC8866]
Note
Standards Track RFC preferred.
Available Formats
[IMG]
CSV
Type SDP Name Reference
proto RTP/AVP [RFC8866]
proto udp [RFC8866]
proto vat [1]
proto rtp [1]
proto udptl [ITU-T Recommendation T.38, 'Procedures for real-time Group 3 facsimile communication over IP networks', June 1998.
(Section 9)]
proto TCP [RFC4145]
proto RTP/AVPF [RFC4585]
proto TCP/RTP/AVP [RFC4571]
proto RTP/SAVP [RFC3711]
proto TCP/BFCP [RFC8856]
proto TCP/TLS/BFCP [RFC8856]
proto TCP/TLS [RFC8122]
proto FLUTE/UDP [RFC-mehta-rmt-flute-sdp-05]
proto TCP/MSRP [RFC4975]
proto TCP/TLS/MSRP [RFC4975]
proto DCCP [RFC5762]
proto DCCP/RTP/AVP [RFC5762]
proto DCCP/RTP/SAVP [RFC5762]
proto DCCP/RTP/AVPF [RFC5762]
proto DCCP/RTP/SAVPF [RFC5762]
proto RTP/SAVPF [RFC5124]
proto UDP/TLS/RTP/SAVP [RFC5764]
proto DCCP/TLS/RTP/SAVP [RFC5764]
proto UDP/TLS/RTP/SAVPF [RFC5764]
proto DCCP/TLS/RTP/SAVPF [RFC5764]
proto UDP/MBMS-FEC/RTP/AVP [RFC6064]
proto UDP/MBMS-FEC/RTP/SAVP [RFC6064]
proto UDP/MBMS-REPAIR [RFC6064]
proto FEC/UDP [RFC6364]
proto UDP/FEC [RFC6364]
proto TCP/MRCPv2 [RFC6787]
proto TCP/TLS/MRCPv2 [RFC6787]
proto PSTN [RFC7195]
proto UDP/TLS/UDPTL [RFC7345]
proto voice [RFC2848]
proto fax [RFC2848]
proto pager [RFC2848]
proto TCP/RTP/AVPF [RFC7850]
proto TCP/RTP/SAVP [RFC7850]
proto TCP/RTP/SAVPF [RFC7850]
proto TCP/DTLS/RTP/SAVP [RFC7850]
proto TCP/DTLS/RTP/SAVPF [RFC7850]
proto TCP/TLS/RTP/AVP [RFC7850]
proto TCP/TLS/RTP/AVPF [RFC7850]
proto TCP/WS/BFCP [RFC8857]
proto TCP/WSS/BFCP [RFC8857]
proto UDP/DTLS/SCTP [RFC8841]
proto TCP/DTLS/SCTP [RFC8841]
proto TCP/DTLS/BFCP [RFC8856]
proto UDP/BFCP [RFC8856]
proto UDP/TLS/BFCP [RFC8856]
bwtype
Registration Procedure(s)
Standards Action
Reference
[RFC8866][RFC8859]
Available Formats
[IMG]
CSV
Type SDP Name Mux Category Reference
bwtype CT NORMAL [RFC8866][RFC8859]
bwtype AS SUM [RFC8866][RFC8859]
bwtype RS SUM [RFC3556][RFC8859]
bwtype RR SUM [RFC3556][RFC8859]
bwtype TIAS SPECIAL [RFC3890][RFC8859]
nettype
Registration Procedure(s)
RFC Required
Reference
[RFC8866]
Available Formats
[IMG]
CSV
Type SDP Name Usable addrtype Values Reference
nettype IN IP4, IP6 [RFC8866]
nettype TN RFC2543 [RFC2848]
nettype ATM NSAP, GWID, E164 [RFC3108]
nettype PSTN E164 [RFC7195]
addrtype
Registration Procedure(s)
RFC Required
Reference
[RFC8866]
Available Formats
[IMG]
CSV
Type SDP Name Reference
addrtype IP4 [RFC8866]
addrtype IP6 [RFC8866]
addrtype NSAP [RFC3108]
addrtype GWID [RFC3108]
addrtype E164 [RFC7195][RFC3108]
enckey
Registration Procedure(s)
REGISTRY OBSOLETED - No further registrations accepted
Reference
[RFC8866]
Available Formats
[IMG]
CSV
Type SDP Name Reference
enckey clear [RFC8866]
enckey base64 [RFC8866]
enckey uri [RFC8866]
enckey prompt [RFC8866]
attribute-name (formerly "att-field")
Registration Procedure(s)
Specification Required
Expert(s)
Flemming Andreasen
Reference
[RFC8866][RFC8864][RFC8859]
Available Formats
[IMG]
CSV
Type SDP Name Usage Mux Category Reference
Level
attribute 3ge2ae media IDENTICAL [3GPP TS 24.229 12.14.0][Frederic_Firmin]
attribute 3gpp_MaxRecvSDUSize session, NORMAL [3GPP TS 26.114 v16.3.0][_3GPP_Specifications_Manager]
media
attribute 3gpp_mtsi_app_adapt media IDENTICAL-PER-PT [3GPP TS 26.114 v16.3.0][Ozgur_Oyman]
attribute 3gpp_sync_info session, NORMAL [3GPP TS 26.114 v16.3.0][_3GPP_Specifications_Manager]
media
attribute 3GPP-Adaptation-Support media CAUTION [RFC6064][RFC8859]
attribute 3GPP-Asset-Information session, CAUTION [RFC6064][RFC8859]
media
attribute 3GPP-Integrity-Key session CAUTION [RFC6064][RFC8859]
attribute 3GPP-QoE-Metrics session, CAUTION [RFC6064][RFC8859]
media
attribute 3GPP-SDP-Auth session CAUTION [RFC6064][RFC8859]
attribute 3GPP-SRTP-Config media CAUTION [RFC6064][RFC8859]
attribute 3gpp-videopostdecbufsize media CAUTION [RFC6064][RFC8859]
attribute 3gpp.iut.replication session, TBD [3GPP TS 24.337 10.7.0][Frederic_Firmin][RFC8859]
media
attribute aal2CPS media CAUTION [RFC3108][RFC8859]
attribute aal2CPSSDUrate media CAUTION [RFC3108][RFC8859]
attribute aal2sscs3661assured media CAUTION [RFC3108][RFC8859]
attribute aal2sscs3661unassured media CAUTION [RFC3108][RFC8859]
attribute aal2sscs3662 media CAUTION [RFC3108][RFC8859]
attribute aal5sscop media CAUTION [RFC3108][RFC8859]
attribute aalApp media CAUTION [RFC3108][RFC8859]
attribute aalType media CAUTION [RFC3108][RFC8859]
attribute abrParms media CAUTION [RFC3108][RFC8859]
attribute abrSetup media CAUTION [RFC3108][RFC8859]
attribute acap session, INHERIT [RFC5939][RFC8859]
media
media,
attribute accept-types dcsa TBD [RFC4975][RFC8859][RFC8873]
(msrp)
media,
attribute accept-wrapped-types dcsa TBD [RFC4975][RFC8859][RFC8873]
(msrp)
attribute acfg media SPECIAL [RFC5939][RFC8859]
attribute alt media CAUTION [RFC6064][RFC8859]
attribute alt-default-id media CAUTION [RFC6064][RFC8859]
attribute alt-group session CAUTION [RFC6064][RFC8859]
attribute altc media TRANSPORT [RFC6947][RFC8859]
attribute anbr media IDENTICAL [3GPP TS 26.114 v16.3.0][Ozgur_Oyman]
attribute anycast media CAUTION [RFC3108][RFC8859]
attribute atmmap media CAUTION [RFC3108][RFC8859]
attribute atmQOSparms media CAUTION [RFC3108][RFC8859]
attribute atmTrfcDesc media CAUTION [RFC3108][RFC8859]
[Sonia_Compans][TS 183 063 R3 ETSI TISPAN Technical Specification TS 183 063 "Telecommunications and
attribute bc_program session NORMAL Internet converged Services and Protocols for Advanced Networking (TISPAN); IMS-based IPTV stage 3
specification"][RFC8859]
[Sonia_Compans][TS 183 063 R3 ETSI TISPAN Technical Specification TS 183 063 "Telecommunications and
attribute bc_service session NORMAL Internet converged Services and Protocols for Advanced Networking (TISPAN); IMS-based IPTV stage 3
specification"][RFC8859]
[Sonia_Compans][TS 183 063 R3 ETSI TISPAN Technical Specification TS 183 063 "Telecommunications and
attribute bc_service_package session NORMAL Internet converged Services and Protocols for Advanced Networking (TISPAN); IMS-based IPTV stage 3
specification"][RFC8859]
attribute bcap session, INHERIT [RFC7006][RFC8859]
media
attribute bcastversion session NORMAL [RFC5159][RFC8859]
attribute bcob media CAUTION [RFC3108][RFC8859]
attribute bearerSigIE media CAUTION [RFC3108][RFC8859]
attribute bearerType media CAUTION [RFC3108][RFC8859]
attribute bfcpver media TBD [RFC8856]
attribute bundle-only media NORMAL [RFC9143]
attribute bw-info media IDENTICAL-PER-PT [3GPP TS 26.114 v16.3.0][Ozgur_Oyman]
attribute cache media CAUTION [RFC3108][RFC8859]
attribute calgextmap session, NORMAL [RFC7266][RFC8859]
media
attribute candidate media TRANSPORT [RFC8839][RFC8859]
attribute capability media CAUTION [RFC3108][RFC8859]
attribute cat session NORMAL [RFC8866][RFC8859]
attribute cbrRate media CAUTION [RFC3108][RFC8859]
attribute ccap session, IDENTICAL [RFC7006][RFC8859]
media
attribute ccc_list session NORMAL [3GPP TS 26.114 v16.3.0][_3GPP_Specifications_Manager]
attribute cdsc session, NORMAL [RFC3407][RFC8859]
media
attribute cfw-id media NORMAL [RFC6230][RFC8859]
attribute chain media CAUTION [RFC3108][RFC8859]
attribute channel media NORMAL [RFC6787][RFC8859]
attribute charset session NORMAL [RFC8866][RFC8859]
attribute charset:iso8895-1 session NORMAL [RFC8866][RFC8859]
attribute chatroom media TBD [RFC7701][RFC8859]
attribute clir session, TBD [RFC2848][RFC8859]
media
attribute clkrec media CAUTION [RFC3108][RFC8859]
attribute cmid media NORMAL [RFC6787][RFC8859]
attribute cname source NORMAL [RFC5576][RFC8859]
attribute codecconfig media CAUTION [RFC3108][RFC8859]
attribute conf media CAUTION [RFC3312][RFC8859]
attribute confid media TBD [RFC8856][RFC8859]
attribute connection session, TRANSPORT [RFC4145][RFC8859]
media
attribute content media NORMAL [RFC4796][RFC8859]
attribute content-desc session, TBD [RFC-mehta-rmt-flute-sdp-05][RFC8859]
media
attribute control session, CAUTION [RFC2326][RFC7826][RFC8859]
media
attribute cpar session, INHERIT [RFC3407][RFC8859]
media
attribute cparmax session, SPECIAL [RFC3407][RFC8859]
media
attribute cparmin session, SPECIAL [RFC3407][RFC8859]
media
attribute cpsSDUsize media CAUTION [RFC3108][RFC8859]
attribute creq session, NORMAL [RFC5939][RFC8859]
media
attribute cryptex session, TRANSPORT [RFC9335]
media
attribute crypto media TRANSPORT [RFC4568][RFC8859]
attribute cs-correlation media TBD [RFC7195][RFC8859]
attribute csup session, NORMAL [RFC5939][RFC8859]
media
attribute curr media CAUTION [RFC3312][RFC8859]
attribute dccp-port media CAUTION [RFC6773][RFC8859]
attribute dccp-service-code media CAUTION [RFC5762][RFC8859]
attribute dcmap media SPECIAL [RFC8864]
attribute dcsa media SPECIAL [RFC8864]
attribute depend media IDENTICAL-PER-PT [RFC5583][RFC8859]
attribute des media CAUTION [RFC3312][RFC8859]
attribute dsel media CAUTION [RFC3108][RFC8859]
attribute duplication-delay session, NORMAL [RFC7197][RFC8859]
media
attribute ebuacip media TBD [EBU Tech 3368 - Audio Contribution over IP ¨C Profiles][Felix_Poulin][RFC8859]
attribute ecan media CAUTION [RFC3108][RFC8859]
attribute ecn-capable-rtp media IDENTICAL [RFC6679][RFC8859]
attribute eecid media CAUTION [RFC3108][RFC8859]
attribute end-of-candidates session, IDENTICAL [RFC8840]
media
attribute etag session, CAUTION [RFC2326][RFC8859]
media
attribute extmap session, SPECIAL [RFC8285][RFC8859]
media
attribute extmap-allow-mixed session, IDENTICAL [RFC8285]
media
attribute fec media CAUTION [RFC3108][RFC8859]
attribute FEC media NORMAL [RFC-mehta-rmt-flute-sdp-05][RFC8859]
attribute FEC-declaration session, TBD [RFC-mehta-rmt-flute-sdp-05][RFC8859]
media
attribute FEC-OTI-extension session, TBD [RFC-mehta-rmt-flute-sdp-05][RFC8859]
media
attribute fec-repair-flow media SPECIAL [RFC6364][RFC8859]
attribute fec-source-flow media SPECIAL [RFC6364][RFC8859]
media,
attribute file-date dcsa TBD [RFC5547][RFC8859][RFC8873]
(msrp)
media,
attribute file-disposition dcsa TBD [RFC5547][RFC8859][RFC8873]
(msrp)
media,
attribute file-icon dcsa TBD [RFC5547][RFC8859][RFC8873]
(msrp)
media,
attribute file-range dcsa TBD [RFC5547][RFC8859][RFC8873]
(msrp)
media,
attribute file-selector dcsa TBD [RFC5547][RFC8859][RFC8873]
(msrp)
media,
attribute file-transfer-id dcsa TBD [RFC5547][RFC8859][RFC8873]
(msrp)
attribute fingerprint session, TRANSPORT [RFC8122][RFC8859]
media
attribute floorctrl media TBD [RFC8856][RFC8859]
attribute floorid media TBD [RFC8856][RFC8859]
attribute flute-ch session, TBD [RFC-mehta-rmt-flute-sdp-05][RFC8859]
media
attribute flute-tsi session, TBD [RFC-mehta-rmt-flute-sdp-05][RFC8859]
media
media,
attribute fmtp source, IDENTICAL-PER-PT [RFC5576][RFC8866][RFC8859][RFC8865]
dcsa
(t140)
attribute framerate media IDENTICAL-PER-PT [RFC8866][RFC8859]
attribute framesize media CAUTION [RFC6064][RFC8859]
attribute fsel media CAUTION [RFC3108][RFC8859]
attribute gc media CAUTION [RFC3108][RFC8859]
attribute gpmd media TBD [ITU-T Rec. V.150.1][ITU-T Rec. V.152][Simao_Campos-Neto]
attribute group session NORMAL [RFC5888][RFC8859]
attribute h248item session, SPECIAL [ITU-T H.248.15][RFC8859]
media
media,
attribute hlang-recv dcsa NORMAL [RFC8373][RFC8865]
(t140)
media,
attribute hlang-send dcsa NORMAL [RFC8373][RFC8865]
(t140)
attribute icap session, NORMAL [RFC7006][RFC8859]
media
attribute ice-lite session NORMAL [RFC8839][RFC8859]
attribute ice-mismatch media NORMAL [RFC8839][RFC8859]
attribute ice-options session NORMAL [RFC8839][RFC8859]
attribute ice-pacing session NORMAL [RFC8839]
attribute ice-pwd session, TRANSPORT [RFC8839][RFC8859]
media
attribute ice-ufrag session, TRANSPORT [RFC8839][RFC8859]
media
attribute identity session NORMAL [RFC8827]
attribute ike-setup session, IDENTICAL [RFC6193][RFC8859]
media
attribute imageattr media IDENTICAL-PER-PT [RFC6236][RFC8859]
session,
media,
attribute inactive dcsa NORMAL [RFC8866][RFC8859][RFC8865][RFC8873]
(t140),
dcsa
(msrp)
attribute ipbcp session SPECIAL [ITU-T Recommendation Q.1970, "BICC IP bearer control protocol" (07/2001)][RFC8859]
attribute isup_usi media CAUTION [RFC3108][RFC8859]
attribute key-mgmt session, IDENTICAL [RFC4567][RFC8859]
media
attribute keywds session NORMAL [RFC8866][RFC8859]
attribute label media NORMAL [RFC4574][RFC8859]
attribute lang session, NORMAL [RFC8866][RFC8859]
media
attribute lcfg media SPECIAL [RFC6871][RFC8859]
attribute lij media CAUTION [RFC3108][RFC8859]
attribute loopback media NORMAL [RFC6849][RFC8859]
attribute loopback-mirror media NORMAL [RFC6849][RFC8859]
attribute loopback-source media NORMAL [RFC6849][RFC8859]
attribute max-message-size media CAUTION [RFC8841]
media,
attribute max-size dcsa TBD [RFC4975][RFC8859][RFC8873]
(msrp)
attribute maxmptime media TBD [ITU-T Recommendation V.152 "Procedures for supporting voice-band data over IP networks", September
2010][Simao_Campos-Neto]
attribute maxprate session, SPECIAL [RFC3890][RFC8859]
media
attribute maxptime media IDENTICAL-PER-PT [RFC8866][RFC8859]
attribute mbms-flowid media CAUTION [RFC6064][RFC8859]
attribute mbms-mode session, CAUTION [RFC6064][RFC8859]
media
attribute mbms-repair session, CAUTION [RFC6064][RFC8859]
media
session,
attribute mediaclk media, NORMAL [RFC7273][RFC8859]
source
attribute mfcap session, IDENTICAL-PER-PT [RFC6871][RFC8859]
media
attribute mid media NORMAL [RFC5888][RFC8859]
attribute mscap session, INHERIT [RFC6871][RFC8859]
media
attribute msid media NORMAL [RFC8830]
media,
attribute msrp-cema dcsa TBD [RFC6714][RFC8859][RFC8873]
(msrp)
attribute mtag session, CAUTION [RFC7826][RFC8859]
media
attribute multicast-rtcp session, IDENTICAL [RFC6128][RFC8859]
media
attribute omcap session, NORMAL [RFC6871][RFC8859]
media
attribute omr-codecs media NORMAL [TS 24.229 v10.7.0 table 7.5.2][Frederic_Firmin][RFC8859]
attribute omr-m-att media NORMAL [TS 24.229 v10.7.0 table 7.5.2][Frederic_Firmin][RFC8859]
attribute omr-m-bw media NORMAL [TS 24.229 v10.7.0 table 7.5.2][Frederic_Firmin][RFC8859]
attribute omr-m-cksum media NORMAL [TS 24.229 v10.7.0 table 7.5.2][Frederic_Firmin][RFC8859]
attribute omr-s-att media NORMAL [TS 24.229 v10.7.0 table 7.5.2][Frederic_Firmin][RFC8859]
attribute omr-s-bw media NORMAL [TS 24.229 v10.7.0 table 7.5.2][Frederic_Firmin][RFC8859]
attribute omr-s-cksum media NORMAL [TS 24.229 v10.7.0 table 7.5.2][Frederic_Firmin][RFC8859]
attribute onewaySel media CAUTION [RFC3108][RFC8859]
attribute orient media NORMAL [RFC8866][RFC8859]
attribute orient:landscape media NORMAL [RFC8866][RFC8859]
attribute orient:portrait media NORMAL [RFC8866][RFC8859]
attribute orient:seascape media NORMAL [RFC8866][RFC8859]
media,
attribute path dcsa TBD [RFC4975][RFC8859][RFC8873]
(msrp)
attribute pcfg media SPECIAL [RFC5939][RFC8859]
attribute phone-context session, TBD [RFC2848][RFC8859]
media
attribute pmft media TBD [ITU-T Recommendation V.152 "Procedures for supporting voice-band data over IP networks", September
2010][Simao_Campos-Neto]
attribute portmapping-req media CAUTION [RFC6284][RFC8859]
attribute predefined_ROI media IDENTICAL-PER-PT [3GPP TS 26.114 v16.3.0][_3GPP_Specifications_Manager]
attribute previous-ssrc source NORMAL [RFC5576][RFC8859]
attribute profileDesc media CAUTION [RFC3108][RFC8859]
attribute prtfl media CAUTION [RFC3108][RFC8859]
[Sonia_Compans][TS 183 063 R3 ETSI TISPAN Technical Specification TS 183 063 "Telecommunications and
attribute PSCid session NORMAL Internet converged Services and Protocols for Advanced Networking (TISPAN); IMS-based IPTV stage 3
specification"][RFC8859]
attribute psk-fingerprint session, IDENTICAL [RFC6193][RFC8859]
media
attribute ptime media IDENTICAL-PER-PT [RFC8866][RFC8859]
attribute Q763-INN session, TBD [RFC2848][RFC8859]
media
attribute Q763-nature session, TBD [RFC2848][RFC8859]
media
attribute Q763-plan session, TBD [RFC2848][RFC8859]
media
attribute qos-mech-recv session, TRANSPORT [RFC5432][RFC8859]
media
attribute qos-mech-send session, TRANSPORT [RFC5432][RFC8859]
media
attribute qosClass media CAUTION [RFC3108][RFC8859]
attribute quality media NORMAL [RFC8866][RFC8859]
attribute rams-updates media CAUTION [RFC6285][RFC8859]
attribute range session, CAUTION [RFC2326][RFC7826][RFC8859]
media
attribute record session, TBD [RFC7866][RFC8859]
media
attribute recordpref session, TBD [RFC7866][RFC8859]
media
session,
media,
attribute recvonly dcsa NORMAL [RFC8866][RFC8859][RFC8865][RFC8873]
(t140),
dcsa
(msrp)
attribute remote-candidates media TRANSPORT [RFC8839][RFC8859]
attribute repair-window media SPECIAL [RFC6364][RFC8859]
attribute require session, TBD [RFC2848][RFC8859]
media
attribute resource media NORMAL [RFC6787][RFC8859]
attribute rid media SPECIAL [RFC8851]
attribute rmcap session, IDENTICAL-PER-PT [RFC6871][RFC8859]
media
attribute rtcp media TRANSPORT [RFC3605][RFC8859]
attribute rtcp-fb media IDENTICAL-PER-PT [RFC4585][RFC8859]
attribute rtcp-idms media NORMAL [RFC7272][RFC8859]
attribute rtcp-mux media IDENTICAL [RFC5761][RFC8035][RFC8859]
attribute rtcp-mux-only media IDENTICAL [RFC8858]
attribute rtcp-rgrp session, IDENTICAL [RFC8861][RFC8859]
media
attribute rtcp-rsize media IDENTICAL [RFC5506][RFC8859]
attribute rtcp-unicast media IDENTICAL [RFC5760][RFC8859]
attribute rtcp-xr session, NORMAL [RFC3611][RFC8859]
media
attribute rtpmap media IDENTICAL-PER-PT [RFC8866][RFC8859]
attribute rtpred1 media CAUTION [2][RFC8859]
attribute rtpred2 media CAUTION [2][RFC8859]
attribute rtsp-ice-d-m session TBD [RFC7825][RFC8859]
attribute rtt-mixer media NORMAL [RFC9071, Section 2.3]
attribute sbc media CAUTION [RFC3108][RFC8859]
attribute sctp-port media CAUTION [RFC8841]
attribute sdplang session, NORMAL [RFC8866][RFC8859]
media
attribute secondary-realm media TRANSPORT [TS 24.229 v10.7.0 table 7.5.2][Frederic_Firmin][RFC8859]
session,
media,
attribute sendonly dcsa NORMAL [RFC8866][RFC8859][RFC8865][RFC8873]
(t140),
dcsa
(msrp)
session,
media,
attribute sendrecv dcsa NORMAL [RFC8866][RFC8859][RFC8865][RFC8873]
(t140),
dcsa
(msrp)
attribute sescap session CAUTION [RFC6871][RFC8859]
session,
attribute setup media, TRANSPORT [RFC4145][RFC8859][RFC8873]
dcsa
(msrp)
attribute silenceSupp media CAUTION [RFC3108][RFC8859]
attribute simulcast media NORMAL [RFC8853]
attribute source-filter session, IDENTICAL [RFC4570][RFC8859]
media
attribute sqn session, NORMAL [RFC3407][RFC8859]
media
attribute SRTPAuthentication media TBD [RFC5159][RFC8859]
attribute SRTPROCTxRate media TBD [RFC5159][RFC8859]
attribute ssrc media NORMAL [RFC5576][RFC8859]
attribute ssrc-group media NORMAL [RFC5576][RFC8859]
attribute stc media CAUTION [RFC3108][RFC8859]
attribute stkmstream session, NORMAL [RFC5159][RFC8859]
media
attribute structure media CAUTION [RFC3108][RFC8859]
attribute suspended session, TBD [NENA STA-010.2-2016][Brian_Rosen][RFC8859]
media
attribute T38FaxFillBitRemoval media TBD [ITU-T Recommendation T.38 Amendment 2 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][RFC8859]
attribute T38FaxMaxBuffer media TBD [ITU-T Recommendation T.38 Amendment 2 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][RFC8859]
attribute T38FaxMaxDatagram media TBD [ITU-T Recommendation T.38 Amendment 2 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][RFC8859]
attribute T38FaxMaxIFP media TBD [ITU-T Recommendation T.38 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][Simao_Campos-Neto][RFC8859]
attribute T38FaxRateManagement media TBD [ITU-T Recommendation T.38 Amendment 2 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][RFC8859]
attribute T38FaxTranscodingJBIG media TBD [ITU-T Recommendation T.38 Amendment 2 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][RFC8859]
attribute T38FaxTranscodingMMR media TBD [ITU-T Recommendation T.38 Amendment 2 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][RFC8859]
attribute T38FaxUdpEC media TBD [ITU-T Recommendation T.38 Amendment 2 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][RFC8859]
attribute T38FaxUdpECDepth media TBD [ITU-T Recommendation T.38 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][Simao_Campos-Neto][RFC8859]
attribute T38FaxUdpFECMaxSpan media TBD [ITU-T Recommendation T.38 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][Simao_Campos-Neto][RFC8859]
attribute T38FaxVersion media TBD [ITU-T Recommendation T.38 Amendment 2 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][RFC8859]
attribute T38MaxBitRate media TBD [ITU-T Recommendation T.38 Amendment 2 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][RFC8859]
attribute T38ModemType media TBD [ITU-T Recommendation T.38 Annex D, 'SIP/SDP Call Establishment Procedures', September
2010][Simao_Campos-Neto][RFC8859]
attribute T38VendorInfo media TBD [ITU-T Recommendation T.38 Amendment 2 Annex D, 'SIP/SDP Call Establishment Procedures', February
2000, July 2005.][RFC8859]
attribute tcap session, INHERIT [RFC5939][RFC8859]
media
attribute tls-id media IDENTICAL [RFC8842]
attribute tool session NORMAL [RFC8866][RFC8859]
attribute tra-att session, NORMAL [http://www.3gpp.org/ftp/Specs/html-info/24229.htm][http://www.3gpp.org/ftp/Specs/html-info/24371.htm]
media
attribute tra-bw session, NORMAL [http://www.3gpp.org/ftp/Specs/html-info/24229.htm][http://www.3gpp.org/ftp/Specs/html-info/24371.htm]
media
attribute tra-contact session, NORMAL [http://www.3gpp.org/ftp/Specs/html-info/24229.htm][http://www.3gpp.org/ftp/Specs/html-info/24371.htm]
media
attribute tra-m-line media NORMAL [http://www.3gpp.org/ftp/Specs/html-info/24229.htm][http://www.3gpp.org/ftp/Specs/html-info/24371.htm]
attribute tra-media-line-number session NORMAL [http://www.3gpp.org/ftp/Specs/html-info/24229.htm][http://www.3gpp.org/ftp/Specs/html-info/24371.htm]
attribute tra-SCTP-association media NORMAL [http://www.3gpp.org/ftp/Specs/html-info/24229.htm][http://www.3gpp.org/ftp/Specs/html-info/24371.htm]
session,
attribute ts-refclk media, NORMAL [RFC7273][RFC8859]
source
attribute type session NORMAL [RFC8866][RFC8859]
attribute type:H332 session NORMAL [ITU Recommendation H.332][RFC8859]
attribute type:broadcast session NORMAL [RFC8866][RFC8859]
attribute type:meeting session NORMAL [RFC8866][RFC8859]
attribute type:moderated session NORMAL [RFC8866][RFC8859]
attribute type:test session NORMAL [RFC8866][RFC8859]
attribute uiLayer1_Prot media CAUTION [RFC3108][RFC8859]
attribute upcc media CAUTION [RFC3108][RFC8859]
attribute userid media TBD [RFC8856][RFC8859]
attribute vbd (OBSOLETE) media TBD [ITU-T Recommendation V.152 "Procedures for supporting voice-band data over IP networks", September
2010][Simao_Campos-Neto]
attribute visited-realm media TRANSPORT [TS 24.229 v10.7.0 table 7.5.2][Frederic_Firmin][RFC8859]
attribute vndpar session, TBD [ITU-T Rec. V.150.1][ITU-T Rec. V.152][Simao_Campos-Neto]
media
attribute vsel media CAUTION [RFC3108][RFC8859]
attribute websocket-uri media CAUTION [RFC8124]
attribute X-decbyterate media CAUTION [RFC6064][RFC8859]
attribute X-initpostdecbufperiod media CAUTION [RFC6064][RFC8859]
attribute X-initpredecbufperiod media CAUTION [RFC6064][RFC8859]
attribute X-predecbufsize media CAUTION [RFC6064][RFC8859]
attribute zrtp-hash media TRANSPORT [RFC6189][RFC8859]
content SDP Parameters
Registration Procedure(s)
Specification Required
Expert(s)
Christer Holmberg
Reference
[RFC4796][RFC8859]
Available Formats
[IMG]
CSV
Type SDP Name Description Mux Category Reference
content slides Presentation slides NORMAL [RFC4796][RFC8859]
content speaker Image from the speaker NORMAL [RFC4796][RFC8859]
content sl Sign language NORMAL [RFC4796][RFC8859]
content main Main media stream NORMAL [RFC4796][RFC8859]
content alt Alternative media stream NORMAL [RFC4796][RFC8859]
Stream associated with the 3GPP
content g.3gpp.cat Customized Alerting Ringtone (CAT) NORMAL [3GPP TS 24.182 v11.2.0][Frederic_Firmin][RFC8859]
service
Stream associated with the 3GPP [3GPP TS 24.183 v9.10.0 annex
content g.3gpp.crs Customized Ringing Signal (CRS) NORMAL E][Frederic_Firmin][RFC8859]
service
Stream associated with video
content g.3gpp.announcement-no-confirmation announcement service without user NORMAL [3GPP TS 24.229]
confirmation
Semantics for the "group" SDP Attribute
Registration Procedure(s)
Standards Action
Reference
[RFC5888][RFC8859]
Available Formats
[IMG]
CSV
Semantics Token Mux Category Reference
Lip Synchronization LS NORMAL [RFC5888][RFC8859]
Flow Identification FID NORMAL [RFC5888][RFC8859]
Single Reservation flow SRF NORMAL [RFC3524][RFC8859]
Alternative Network Address Types ANAT CAUTION [RFC4091][RFC8859]
Forward Error Correction (Deprecated) FEC NORMAL [RFC5956][RFC8859]
Forward Error Correction FR FEC-FR NORMAL [RFC5956][RFC8859]
Composite Session CS NORMAL [RFC-mehta-rmt-flute-sdp-05][RFC8859]
Decoding Dependency DDP NORMAL [RFC5583][RFC8859]
Duplication DUP NORMAL [RFC7104][RFC8859]
Splice SPLICE TBD [RFC8286][RFC8859]
Media bundling BUNDLE NORMAL [RFC9143]
CLUE-controlled "m=" line CLUE NORMAL [RFC8848]
"rtcp-fb" Attribute Values
Registration Procedure(s)
First Come First Served with permanent, stable, and publically accessible document.
Reference
[RFC4585][RFC8859]
Available Formats
[IMG]
CSV
Value Name Long Name Mux Category Reference
ack Positive acknowledgement IDENTICAL-PER-PT [RFC4585][RFC8859]
app Application-defined parameter SPECIAL [RFC4585][RFC8859]
ccm Codec Control Commands and Indications IDENTICAL-PER-PT [RFC5104][RFC8859]
nack Negative Acknowledgement IDENTICAL-PER-PT [RFC4585][RFC8859]
trr-int Minimal receiver report interval IDENTICAL-PER-PT [RFC4585][RFC8859]
3gpp-roi-arbitrary Video region-of-interest (ROI) arbitrarily selected by the endpoint IDENTICAL-PER-PT [3GPP TS 26.114 v16.3.0][Ozgur_Oyman]
3gpp-roi-predefined Video region-of-interest (ROI) pre-defined by the sender and selected IDENTICAL-PER-PT [3GPP TS 26.114 v16.3.0][Ozgur_Oyman]
by the endpoint
3gpp-delay-budget Available or requested delay budget specified in milliseconds IDENTICAL-PER-PT [3GPP TS 26.114 v16.3.0][Ozgur_Oyman]
3gpp-viewport Viewport feedback for viewport-dependent 360-degree video IDENTICAL-PER-PT [3GPP TS 26.114]
"ack" and "nack" Attribute Values
Registration Procedure(s)
First Come First Served with a permanent, stable, and publically accessible document
Reference
[RFC4585][RFC8859]
Available Formats
[IMG]
CSV
Value Name Long Name Usable with Mux Reference
sli Slice Loss Indication nack IDENTICAL-PER-PT [RFC4585][RFC8859]
pli Picture Loss Indication nack IDENTICAL-PER-PT [RFC4585][RFC8859]
rpsi Reference Picture Selection Indication ack, nack IDENTICAL-PER-PT [RFC4585][RFC8859]
app Application layer feedback ack, nack SPECIAL [RFC4585][RFC8859]
rai Rapid Acquisition Indication nack IDENTICAL-PER-PT [RFC6285][RFC8859]
tllei Transport-Layer Third-Party Loss Early Indication nack IDENTICAL-PER-PT [RFC6642][RFC8859]
pslei Payload-Specific Third-Party Loss Early Indication nack IDENTICAL-PER-PT [RFC6642][RFC8859]
ecn Explicit Congestion Notification nack IDENTICAL [RFC6679][RFC8859]
ccfb Congestion Control Feedback ack IDENTICAL-PER-PT [RFC8888]
"depend" SDP Attribute Values
Registration Procedure(s)
Specification Required
Expert(s)
Stephan Wenger
Reference
[RFC5583][RFC8859]
Available Formats
[IMG]
CSV
Token Semantics Mux Category Reference
lay Layered decoding dependency IDENTICAL-PER-PT [RFC5583][RFC8859]
mdc Multi descriptive decoding dependency IDENTICAL-PER-PT [RFC5583][RFC8859]
"cs-correlation" Attribute Values
Registration Procedure(s)
Specification Required
Expert(s)
Bo Burman
Reference
[RFC7195][RFC8859]
Available Formats
[IMG]
CSV
Value Description Mux Category Reference
callerid Caller ID TBD [RFC7195][RFC8859]
uuie User-User Information Element TBD [RFC7195][RFC8859]
dtmf Dual-tone Multi-Frequency TBD [RFC7195][RFC8859]
external External TBD [RFC7195][RFC8859]
Semantics for the "ssrc-group" SDP Attribute
Registration Procedure(s)
Standards Action
Reference
[RFC5576][RFC8859]
Available Formats
[IMG]
CSV
Token Semantics Mux Category Reference
FID Flow Identification NORMAL [RFC5576][RFC8859]
FEC Forward Error Correction NORMAL [RFC5576][RFC8859]
FEC-FR Forward Error Correction FR NORMAL [RFC5956][RFC8859]
DUP Duplication NORMAL [RFC7104][RFC8859]
SDP/RTSP key management protocol identifiers
Registration Procedure(s)
Specification Required
Expert(s)
Magnus Westerlund
Reference
[RFC4567][RFC8859]
Note
This registry of the key management protocol identifier,
KMPID, has a name space that is shared between the SDP "key-mgmt"
attribute and RTSP header "keymgmt".
Available Formats
[IMG]
CSV
Value Name Long Name Mux Category Reference
mikey Multimedia Internet KEYing IDENTICAL [RFC4567][RFC8859]
Codec Control Messages
Registration Procedure(s)
Specification Required
Expert(s)
Stephan Wenger
Reference
[RFC5104][RFC8859]
Available Formats
[IMG]
CSV
Value Name Long Name Usable with Mux Reference
fir Full Intra Request Command ccm IDENTICAL-PER-PT [RFC5104][RFC8859]
tmmbr Temporary Maximum Media Stream Bit Rate ccm IDENTICAL-PER-PT [RFC5104][RFC8859]
tstr Temporal-Spatial Trade-off ccm IDENTICAL-PER-PT [RFC5104][RFC8859]
vbcm H.271 video back channel messages ccm IDENTICAL-PER-PT [RFC5104][RFC8859]
pause Media Pause/Resume ccm TBD [RFC7728][RFC8859]
lrr Layer Refresh Request Command ccm IDENTICAL-PER-PT [RFC9627]
QoS Mechanism Tokens
Registration Procedure(s)
Specification Required
Expert(s)
Christer Holmberg
Reference
[RFC5432][RFC8859]
Available Formats
[IMG]
CSV
QoS Mechanism Mux Category Reference
rsvp TRANSPORT [RFC5432][RFC8859]
nsis TRANSPORT [RFC5432][RFC8859]
SDP Capability Negotiation Option Tags
Registration Procedure(s)
IETF Review
Reference
[RFC5939][RFC8859]
Available Formats
[IMG]
CSV
Option Tag Mux Category Reference
cap-v0 NORMAL [RFC5939][RFC8859]
med-v0 NORMAL [RFC6871][RFC8859]
bcap-v0 NORMAL [RFC7006][RFC8859]
ccap-v0 NORMAL [RFC7006][RFC8859]
icap-v0 NORMAL [RFC7006][RFC8859]
SDP Capability Negotiation Configuration Parameters Registry
Registration Procedure(s)
IETF Review
Reference
[RFC5939][RFC6871]
Available Formats
[IMG]
CSV
Encoding Name Descriptive Name Potential Configuration Actual Configuration Definition Latent Configuration Definition
Definition
a Attribute Configuration [RFC5939] [RFC5939] [RFC6871]
b Bandwidth [RFC7006] [RFC7006] [RFC7006]
c Connection Data [RFC7006] [RFC7006] [RFC7006]
i Title [RFC7006] [RFC7006] [RFC7006]
m Media Configuration [RFC6871] [RFC6871] [RFC6871]
mt Media Type [RFC6871] [RFC6871] [RFC6871]
pt Payload Type Number Mapping [RFC6871] [RFC6871] [RFC6871]
t Transport Protocol Configuration [RFC5939] [RFC5939] [RFC6871]
Timestamp Reference Clock Source Parameters
Registration Procedure(s)
Specification Required
Expert(s)
Magnus Westerlund
Reference
[RFC7273][RFC8859]
Available Formats
[IMG]
CSV
Name Long Name Mux Category Reference
ntp Network Time Protocol NORMAL [RFC7273, section 4][RFC8859]
ptp Precision Time Protocol NORMAL [RFC7273, section 4][RFC8859]
gps Global Positioning System NORMAL [RFC7273, section 4][RFC8859]
gal Galileo NORMAL [RFC7273, section 4][RFC8859]
glonass Global Navigation Satellite System NORMAL [RFC7273, section 4][RFC8859]
local Local Clock NORMAL [RFC7273, section 4][RFC8859]
private Private Clock NORMAL [RFC7273, section 4][RFC8859]
Media Clock Source Parameters
Registration Procedure(s)
Specification Required
Expert(s)
Magnus Westerlund
Reference
[RFC7273][RFC8859]
Available Formats
[IMG]
CSV
Name Long Name Mux Category Reference
sender Asynchronously Generated Media Clock NORMAL [RFC7273, section 5][RFC8859]
direct Direct-Referenced Media Clock NORMAL [RFC7273, section 5][RFC8859]
IEEE1722 IEEE1722 Media Stream Identifier NORMAL [RFC7273, section 5][RFC8859]
Multiplexing Categories
Registration Procedure(s)
Standards Action
Reference
[RFC8859]
Available Formats
[IMG]
CSV
Multiplexing Categories Reference
NORMAL [RFC8859]
CAUTION [RFC8859]
IDENTICAL [RFC8859]
TRANSPORT [RFC8859]
SUM [RFC8859]
INHERIT [RFC8859]
IDENTICAL-PER-PT [RFC8859]
SPECIAL [RFC8859]
TBD [RFC8859]
association-usage Name Registry
Registration Procedure(s)
First Come First Served
Reference
[RFC8841]
Available Formats
[IMG]
CSV
Name Reference Change Controller
webrtc-datachannel [RFC8841][RFC8832] IESG
RID Attribute Parameters
Registration Procedure(s)
Specification Required
Expert(s)
Adam Roach
Reference
[RFC8851]
Available Formats
[IMG]
CSV
RID Parameter Name Reference
pt [RFC8851]
max-width [RFC8851]
max-height [RFC8851]
max-fps [RFC8851]
max-fs [RFC8851]
max-br [RFC8851]
max-pps [RFC8851]
max-bpp [RFC8851]
depend [RFC8851]
Candidate Attribute Extensions
Registration Procedure(s)
Specification Required
Expert(s)
Christer Holmberg
Reference
[RFC8839]
Name Description Change Controller Reference
No registrations at this time.
Contact Information
ID Name Contact URI Last Updated
[_3GPP_Specifications_Manager] 3GPP Specifications Manager mailto:3gppContact&etsi.org 2017-06-16
[Brian_Rosen] Brian Rosen mailto:br&brianrosen.net 2016-10-11
[Felix_Poulin] Felix Poulin, EBU-FNS Coordinator mailto:poulin&ebu.ch 2016-11-17
[Frederic_Firmin] Frederic Firmin mailto:frederic.firmin&etsi.org 2020-09-04
[Ozgur_Oyman] Ozgur Oyman mailto:ozgur.oyman&intel.com 2019-11-06
[Simao_Campos-Neto] Sim?o Campos-Neto mailto:simao.campos&itu.int 2019-07-30
[Sonia_Compans] Sonia Compans mailto:Sonia.Compans&etsi.org 2010-11-24
Footnotes
[1] historic
[2] historic; use fmtp as per [RFC2198]
Licensing Terms
Presently we were in a very dark road, and at a point where it dropped suddenly between steep sides we halted in black shadow. A gleam of pale sand, a whisper of deep flowing waters, and a farther glimmer of more sands beyond them challenged our advance. We had come to a "grapevine ferry." The scow was on the other side, the water too shoal for the horses to swim, and the bottom, most likely, quicksand. Out of the blackness of the opposite shore came a soft, high-pitched, quavering, long-drawn, smothered moan of woe, the call of that snivelling little sinner the screech-owl. Ferry murmured to me to answer it and I sent the same faint horror-stricken tremolo back. Again it came to us, from not farther than one might toss his cap, and I followed Ferry down to the water's edge. The grapevine guy swayed at our side, we heard the scow slide from the sands, and in a few moments, moved by two videttes, it touched our shore. Soon we were across, the two videttes riding with us, and beyond a sharp rise, in an old opening made by the swoop of a hurricane, we entered the silent unlighted bivouac of Ferry's scouts. Ferry got down and sat on the earth talking with Quinn, while the sergeants quietly roused the sleepers to horse. Plotinus is driven by this perplexity to reconsider the whole theory of Matter.477 He takes Aristotle¡¯s doctrine as the groundwork of his investigation. According to this, all existence is divided into Matter and Form. What we know of things¡ªin other words, the sum of their differential characteristics¡ªis their Form. Take away this, and the unknowable residuum is their Matter. Again, Matter is the vague indeterminate something out of which particular Forms are developed. The two are related as Possibility to Actuality, as the more generic to the more specific substance through every grade of classification and composition. Thus there are two Matters, the one sensible and the other intelligible. The former constitutes the common substratum of bodies, the other the common element of ideas.478 The general distinction between Matter and Form was originally suggested to Aristotle by Plato¡¯s remarks on the same subject; but he differs325 from his master in two important particulars. Plato, in his Timaeus, seems to identify Matter with space.479 So far, it is a much more positive conception than the ?λη of the Metaphysics. On the other hand, he constantly opposes it to reality as something non-existent; and he at least implies that it is opposed to absolute good as a principle of absolute evil.480 Thus while the Aristotelian world is formed by the development of Power into Actuality, the Platonic world is composed by the union of Being and not-Being, of the Same and the Different, of the One and the Many, of the Limit and the Unlimited, of Good and Evil, in varying proportions with each other. The Lawton woman had heard of an officer's family at Grant, which was in need of a cook, and had gone there. [See larger version] On the 8th of July an extraordinary Privy Council was summoned. All the members, of whatever party, were desired to attend, and many were the speculations as to the object of their meeting. The general notion was that it involved the continuing or the ending of the war. It turned out to be for the announcement of the king's intended marriage. The lady selected was Charlotte, the second sister of the Duke of Mecklenburg-Strelitz. Apart from the narrowness of her education, the young princess had a considerable amount of amiability, good sense, and domestic taste. These she shared with her intended husband, and whilst they made the royal couple always retiring, at the same time they caused them to give, during their lives, a moral air to their court. On the 8th of September Charlotte arrived at St. James's, and that afternoon the marriage took place, the ceremony being performed by the Archbishop of Canterbury. On the 22nd the coronation took place with the greatest splendour. Mother and girls were inconsolable, for each had something that they were sure "Si would like," and would "do him good," but they knew Josiah Klegg, Sr., well enough to understand what was the condition when he had once made up his mind. CHAPTER V. THE YOUNG RECRUITS Si proceeded to deftly construct a litter out of the two guns, with some sticks that he cut with a knife, and bound with pawpaw strips. His voice had sunk very low, almost to sweetness. A soft flurry of pink went over her face, and her eyelids drooped. Then suddenly she braced herself, pulled herself taut, grew combative again, though her voice shook. HoME²Ô¾®Ïè̫ʲôÐÇ×ù
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