[SIPForum-discussion] SIP-SIMPLE Subscribe to RLS and Presence clarification

[Robert Sparks]

On Feb 14, 2007, at 12:12 AM, kamal mann wrote:

> Hi All
> I have 2 queris in SIP-SIMPLE message flow
>
> 1):   When user A sends subscribe to presence for user B and User B  
> accepts it. Is User B added as a Buddy into user A's buddylist  
> (User A as a watcher to user B)?
A is a watcher of B. If your application uses a notion like  
buddylist, then it is likely that this subscription happened  
_because_ B was added to A's buddylist.
> 2):   Why User A keeps refreshing subscription to User B even after  
> B's acceptance for it?
Subscriptions in SIMPLE are soft-state - they are granted only for  
some finite (negotiated at subscription) time. If A does not refresh  
the subscription before it expires, the subscription times-out and is  
terminated. That refresh subscription resets the timeout, setting a  
new expiration.
> Please give your valuable suggustions for the same.
>
> Thanks in anticipation
> Kamal Mann
>
>
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