Dear:Bucur Marius:
        Thank you for your help.
         As you said the presence module does not work if I disable it's 
module. This time I used wireshark to get the packages. I found when I disable 
the presence module, one point send the "Notify" packages directly to the 
other, and there were no changes in the watchers table. And when I enable the 
module, I found it can create some lists in watchers. But at this time , I 
found there is nothing contents in packages like "Subscribe" and 
"Notify".What's more when one point change the state, it dose not send any 
packages to the server.
         You said active_watchers will have something when the subscribe is 
authorised. What dose it mean? My server have not authorised the subscribe? But 
it can have a call with other subscribe.
         Look foreword your help. 
                                                                                
                                                                          haibo 
 huang
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