[JDEV] Privacy control over presence probes?

[Jens Alfke]

A Jabber user has to explicitly approve other users' subscribing to 
their presence, which is a good privacy control. However, there doesn't 
seem to be any control over one-shot <presence type="probe"> requests. 
The JPO (1.4.1.2, p.10) says that the server responds to these, which 
doesn't give the user's client a chance to check for approval.

Many people are concerned about letting random other people discover 
their presence status. Does Jabber provide a way to prevent unauthorized 
people from polling for this information?

—Jens
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