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

RFC 4975 – proposing Message Session Relay Protocol (MSRP)

RFC 4975 – Section 8.2 – Section 8.6
a=accept-types   a=accept-wrapped-types   a=max-size   a=path

 

attribute  =/
accept-types /  accept-wrapped-types /  max-size /  path
accept-types =
accept-types-label  ":"  format-list
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accept-types-label =
"accept-types"
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accept-wrapped-types =
wrapped-types-label  ":"  format-list
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wrapped-types-label =
"accept-wrapped-types"
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format-list =
format-entry  *( SP  format-entry )
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format-entry =
(  ( ( type  "/"  subtype ) /  ( type  "/"  "*" ) )  *( ";"  type-param ) ) /  ( "*" )
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type =
token
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subtype =
token
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type-param =
parm-attribute  "="  parm-value
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parm-attribute =
token
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parm-value =
token /  quoted‑string
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max-size =
max-size-label  ":"  max-size-value
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max-size-label =
"max-size"
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max-size-value =
1*( DIGIT )     ; max size in octets
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path =
path-label  ":"  path-list
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path-label =
"path"
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path-list =
MSRP-URI  *( SP  MSRP-URI> )
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