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Session Description  Addressing  generic rules  "a=" SDP Attributes
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SDP attributes defined in

RFC 5576 – Source-Specific Media Attributes

RFC 5576 – Section 4 – Section 10  —  see also:  IANA
a=ssrc   a=ssrc‑group   a=cname   a=previous‑ssrc

 

attribute  =/
ssrc‑attr /  ssrc‑group‑attr /  cname‑attr /  previous‑ssrc‑attr
ssrc-attr =
"ssrc:"  ssrc-id  SP  attribute
;  see  Section 4.1  and  Figure 4 of RFC 5576
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ssrc-group-attr =
"ssrc-group:"  semantics  *( SP  ssrc‑id )
;  see  Section 4.2  and  Figure 5 of RFC 5576
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semantics =
"FEC"  /     ; see   RFC 5576
"FID"  /     ; see   RFC 5576
"FEC-FR"  /     ; see   RFC 5956 – Section 4.3
"DUP"  /     ; see   RFC 7104 – Section 3.2
token
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cname-attr =
"cname:"  cname
;  see  Section 6.1  and  Figure 6 of RFC 5576
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previous-ssrc-attr =
"previous‑ssrc:"  ssrc‑id  *( SP  ssrc‑id )
;  see  Section 6.2  and  Figure 7 of RFC 5576
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cname =
byte-string
; following the syntax conventions for CNAME as defined in   RFC 3550 – Section 6.5.1
; with guidelines in   RFC 7022
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ssrc-id =
integer
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