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ABNF for SDP
RFC 4566and many other RFCs

Session Description   v=   o=   s=   i=   u=   e=   p=   c=   b=   t=  r=  z=   k=   a=   m=   SDP Addressing   SDP generic rules   "a=" SDP Attributes
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SDP attributes defined in

RFC 7273 – RTP Clock Source Signalling

RFC 7273Section 4.8

 


attribute  =/
timestamp-refclk =
"ts‑refclk:"  clksrc
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clksrc =
ntp /  ptp /  gps /  gal /  glonass /  local /  private /  clksrc‑ext
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clksrc-ext =
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clksrc-param-name =
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clksrc-param-value =
[ "="  byte‑string ]
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ntp =
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ntp-server-addr =
hostport /  "/traceable/"
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ptp =
"ptp="  ptp‑version  ":"  ptp‑server
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ptp-version =
"IEEE1588‑2002" /  "IEEE1588‑2008" /  "IEEE802.1AS‑2011" /  ptp‑version‑ext
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ptp-version-ext =
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ptp-server =
ptp‑gmid  [ ":"  ptp‑domain ] /  "traceable"
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ptp-gmid =
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ptp-domain =
ptp‑domain‑name /  ptp‑domain‑nmbr
; PTP domain allowed characters: 0x21‑0x7E (IEEE 1588‑2002)
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ptp-domain-name =
"domain‑name="  1*16ptp‑domain‑char
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ptp-domain-char =
%x21‑7E
; PTP domain allowed number range: 0‑127 (IEEE 1588‑2008)
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ptp-domain-nmbr =
"domain‑nmbr="  ptp‑domain‑dgts
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ptp-domain-dgts =
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ptp-domain-n1 =
DIGIT     ;  0-9
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ptp-domain-n2 =
POS‑DIGITDIGIT     ;  10-99
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ptp-domain-n3 =
( "10" /  "11" ) DIGIT     ;  100‑119
/  "12" %x30‑37     ;  120‑127
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gps =
"gps"
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gal =
"gal"
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glonass =
"glonass"
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local =
"local"
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private =
"private"  [ ":traceable" ]
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media-clksrc =
"mediaclk:"  [ media‑clkidSP ]  mediaclock
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media-clkid =
"id="  [ "src:" ]  media‑clktag
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media-clktag =
base64
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mediaclock =
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mediaclock-ext =
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mediaclock-param-name =
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mediaclock-param-value =
[ "="  byte‑string ]
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sender =
"sender"
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direct =
"direct"  [ "="  1*DIGIT ]  [ SPrate ]
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rate =
"rate="  integer  "/"  integer
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ieee1722-streamid =
"IEEE1722="  avb‑stream‑id
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avb-stream-id =
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EUI64 =
7( 2HEXDIG  "-" )  2HEXDIG
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