A subscriber issues a UNSUBSCRIBE message to a publisher indicating it is no
longer interested in receiving media for the specified track and requesting that
the publisher stop sending Objects as soon as possible.
The format of UNSUBSCRIBE is as follows:
UNSUBSCRIBE Message {
Type (i) = 0xA,
Length (i),
Subscribe ID (i)
}
-
Subscribe ID: Subscription Identifier as defined in Section 8.6.