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SDP attributes defined in RFC 7273

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RTP Clock Source Signalling
ts-refclk,  mediaclk

RFC 7273 – Section 4.8

a=ts-refclk:   (session- or media-level)
a=mediaclk:   (session- or media-level)


attribute   =/
timestamp-refclk   =
"ts-refclk:"   clksrc

clksrc   =
ntp  /  ptp  /  gps  /  gal  /  glonass  /  local  /  private  /  clksrc-ext

clksrc-ext   =
clksrc-param-name   =
clksrc-param-value   =
[ "="   byte-string ]

ntp   =
"ntp="   ntp-server-addr

ntp-server-addr   =
hostport  /  "/traceable/"

ptp   =
"ptp="   ptp-version   ":"   ptp-server

ptp-version   =
"IEEE1588-2002"  /  "IEEE1588-2008"  /  "IEEE802.1AS-2011"  /  ptp-version-ext

ptp-version-ext   =
ptp-server   =
ptp-gmid   [ ":"   ptp-domain ]  /  "traceable"

ptp-gmid   =
ptp-domain   =
ptp-domain-name  /  ptp-domain-nmbr
;  PTP domain allowed characters: 0x21-0x7E (IEEE 1588-2002)

ptp-domain-name   =
"domain-name="   1*16ptp-domain-char

ptp-domain-char   =
%x21-7E
;  PTP domain allowed number range: 0-127 (IEEE 1588-2008)

ptp-domain-nmbr   =
"domain-nmbr="   ptp-domain-dgts

ptp-domain-dgts   =
ptp-domain-n1   =
DIGIT     ;   0-9

ptp-domain-n2   =
POS-DIGIT   DIGIT     ;   10-99

ptp-domain-n3   =
( "10"  /  "11" ) DIGIT     ;   100-119
/  "12" %x30-37     ;   120-127

gps   =
"gps"

gal   =
"gal"

glonass   =
"glonass"

local   =
"local"

private   =
"private"   [ ":traceable" ]

EUI64   =
7( 2HEXDIG   "-" )   2HEXDIG

media-clksrc   =
"mediaclk:"   [ media-clkid   SP ]   mediaclock

media-clkid   =
"id="   [ "src:" ]   media-clktag

media-clktag   =
base64

mediaclock   =
mediaclock-ext   =
mediaclock-param-name   =
mediaclock-param-value   =
[ "="   byte-string ]

sender   =
"sender"

direct   =
"direct"   [ "="   1*DIGIT ]   [ SP   rate ]

rate   =
"rate="   integer   "/"   integer

ieee1722-streamid   =
"IEEE1722="   avb-stream-id

avb-stream-id   =