Response code of 202 does not indicate that your subscription to a particular 
event package has been accepted.

Quote from 3265:
A 202 response merely indicates that the subscription has been understood, and 
that authorization may or may not have been granted.



> So next time when i need to SUBSCRIBE i should take care of that time
> given in 2xx response  from  server and after that period of 
time i need to SUBSCRIBE again.



The "Expires" header in a 200-class response to SUBSCRIBE indicates
   the actual duration for which the subscription will remain active
   (unless refreshed).



Subscription should be refreshed *BEFORE* the expiry time. Generally, it is 
seconds in Expires header divided by 2. It is implementation dependent though. 
It can be any time before expiry.

Best,
Amith


----- Original Message  -----
From: rishabh 

Thanks for reply but would like to ask,

So like in the message we need to start the SUBSCRIPTION timer on the 
basis of 2XX response from the server...

So next time when i need to SUBSCRIBE i should take care of that time 
given in 2xx response

from  server and after that period of time i need to SUBSCRIBE again.

Regards
Rishabh Jain

Naarumanchi Kaushik wrote:
> Generally the time value mentioned in the SUBSCRIBE's Expires: header 
> is the duration of the subscription which we are proposing to the 
> Server. Based on its local configuration, it could either accept it or 
> reduce it(But not increase it) and send it in 2xx responses. And this 
> is the actual duration of the Subscription.
> You have to send a refresh SUBSCRIBE before that duration considering 
> the network delays...For Eg. 50% of the server suggested time.
>
> On Wed, Aug 12, 2009 at 1:28 PM, rishabh <[email protected] 
> <mailto:[email protected]>> wrote:
>
>     Dear all,
>
>     Can any one suggest which timer value we need to accept if we have
>     SUBSCRIBED the server for timer value 3600 fro MWI...
>
>     And in return if server gives 202 accepted with timer value 2000 which
>     is other then asked in SUBSCRIPTION.
>
>     So for how much time did the server has been SUBSCRIBED and will
>     report
>     me the NOTIFICATION...
>
>     And after how much time I need to SUBCRIBE again to the server..
>
>
>     Regards
>     Rishabh Jain
>     _______________________________________________
>     Sip-implementors mailing list
>     [email protected]
>     <mailto:[email protected]>
> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors >
>
>
>
> -- 
> N.V.S.Kaushik.
> Software Engineeer,
> Motorola, Bangalore.
> Ph: +91-9972500163
   
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