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3.1.5.10.2 Limited support for the a=connection Attribute

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The TCP-based media transport in the SDP, as specified in [RFC4145], states that the a=connection attribute can have the following values to indicate the status of a TCP connection.

"new"

"existing"

When used in the context of this protocol, the a=connection attribute SHOULD<13> have the "existing" value only. The a=connection:new attribute SHOULD only be used with the m=applicationsharing media type, when the initial active media address is TCP-based.

The semantics of the "existing" value is specified in [RFC4145].