PubSub GetSubcription Get All Participant

Hi everyone..

I want to ask how to get subcription by nodeID??

Assumed that i am the owner of the channel.

but when i call

PubSubManager mgr = new PubSubManager(XMPPClient.getInstance()

                                                  .getConnection());

                              Node node = null;

                              node = mgr.getNode(channel);

List<Subscription> subscriptions = node.getSubscriptions();

why the subcriptions values is only my own ID???

how can i get all participant ID?