A (subscription refresh) can be periodic.Logical formLearned from2 sentences. A (state change) may coincide with a (subscription refresh).Logical formLearned from2 sentences. (Source addresses) can be in (client subscription) to (ssm groups).Logical formLearned from2 sentences. Groups can be under subscription.Logical formLearned from2 sentences. A (subscription request) can be in a form.Logical formLearned from2 sentences. A subscription can be from a contact.Logical formLearned from2 sentences. (Presence subscriptions) may be managed.Logical formLearned from2 sentences. A (user agent) may authorize subscriptions.Logical formLearned from2 sentences. (Network subscriptions) may pertain-to a user.Logical formLearned from2 sentences. A behavior can be for subscriptions.Logical formLearned from2 sentences. A (subscription request) can be inbound.Logical formLearned from2 sentences. Synchronization may regard (subscription states).Logical formLearned from2 sentences. A (subscription request) may pertain-to a contact.Logical formLearned from2 sentences. A (subscription request) may pertain-to a user.Logical formLearned from2 sentences. A (subscription request) may be sent to a contact.Logical formLearned from2 sentences.