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

RFC 8373 – Negotiating Human Language in Real-Time Communications

RFC 8373 – Section 5.1
a=hlang‑send   a=hlang‑recv

Note:  no ABNF definitions for theses attributes

;  a=hlang-send:<a list of one or more language(s)>
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;  a=hlang-recv:<a list of one or more language(s)>
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