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

RFC 6849 – Extension to SDP and RTP for Media Loopback

RFC 6849 – Section 4
a=loopback   a=loopback‑source   a=loopback‑mirror

 

attribute  =/
loopback‑attr /  loopback‑source /  loopback‑mirror
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loopback-attr =
"loopback:"  SP  loopback‑type
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loopback-type =
loopback‑choice  [ 1*SP  loopback‑choice ]
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loopback-choice =
loopback‑type‑pkt /  loopback‑type‑media
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loopback-type-pkt =
"rtp‑pkt‑loopback"
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loopback-type-media =
"rtp‑media‑loopback"
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loopback-source =
"loopback‑source"
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loopback-mirror =
"loopback‑mirror"
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