3.1.5.17 No Support for Optional Parameters in the a=rtcp Attribute

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As specified in [RFC3605], the a=rtcp attribute has the following format in ABNF notation, as described in [RFC5234]:

rtcp-attribute =  "a=rtcp:" port  [nettype space addrtype space
                         connection-address] CRLF

Optional parameters are allowed in addition to the port parameter. However, this protocol only supports the use of the port parameter in the a=rtcp attribute and stipulates that the optional parameters after the port parameter MUST NOT be used.