NONE

There is no subscription for the watcher. In order to view the presence or receive updates, the watcher must first request a subscription

ALLOWED

The watcher has been approved for access to the presence. Note that this value is also returned if the watcher has been "politely blocked" by the presentity. In this case the watcher believes he is subscribed to the presentity's presence but will not receive any presence updates

PENDING

There is a pending subscription request by the watcher. While the subscription is pending, the watcher has no access to the presence and will not receive updates

POLITE_BLOCKED

The watcher believes he has access to the presence, but will instead receive no updates and always believe the presentity is unavailable. This value is only returned in the SubscriptionRoster as the value of any from fields.

BLOCKED

The watcher has no access to the presence, and is denied access from even requesting a subscription. TODO is this needed?