Both WF and SE styles create shared reservations, appropriate for those multicast applications whose properties make it unlikely that multiple data sources will transmit simultaneously.
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Packetized audio is an example of an application suitable for shared reservations; since a limited number of people talk at once, each receiver might issue a WF or SE reservation request for twice the bandwidth required for one sender (to allow some over-speaking).
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The FF style, which creates independent reservations for the flows from different senders, is appropriate for video signals.
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