SUBSCRIBE_OK

A publisher sends a SUBSCRIBE_OK control message for successful subscriptions.

SUBSCRIBE_OK Message {
  Type (i) = 0x4,
  Length (16),
  Request ID (i),
  Track Alias (i),
  Number of Parameters (i),
  Parameters (..) ...,
  Track Extensions (..),
}

• Request ID: The Request ID of the SUBSCRIBE this message is replying to Section 9.9.

• Track Alias: The identifer used for this track in Subgroups or Datagrams (see Section 10.1). The same Track Alias MUST NOT be used to refer to two different Tracks simultaneously. If a subscriber receives a SUBSCRIBE_OK that uses the same Track Alias as a different track with an Established subscription, it MUST close the session with error DUPLICATE_TRACK_ALIAS.

• Parameters: The parameters are defined in Section 9.2.2.

• Track Extensions : A sequence of Extension Headers. See Section 2.5.