rfc4566-SDP

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Session description
    v= (protocol version)
    o= (originator and session identifier)
    s= (session name)
    i=* (session information)
    u=* (URI of description)
    e=* (email address)
    p=* (phone number)
    c=* (connection information -- not required if included in all media)
    b=* (zero or more bandwidth information lines)
    One or more time descriptions ("t=" and "r=" lines; see below)
    z=* (time zone adjustments)
    k=* (encryption key)
    a=* (zero or more session attribute lines)
    Zero or more media descriptions
Time description
    t= (time the session is active)
    r=* (zero or more repeat times)
Media description, if present
    m= (media name and transport address)
    i=* (media title)
    c=* (connection information -- optional if included at session level)
    b=* (zero or more bandwidth information lines)
    k=* (encryption key)
    a=* (zero or more media attribute lines)