The publisher sends a TRACK_STATUS_OK control message in response to a successful TRACK_STATUS message.
The TRACK_STATUS_OK message format is identical to the SUBSCRIBE_OK message (Section 9.8).
The publisher populates the fields of TRACK_STATUS_OK exactly as it would have populated a SUBSCRIBE_OK, setting Track Alias to 0. It is not considered an error if Track Alias 0 is already in use by an active subscription.