[SIPForum-discussion] session refresh parameter in response

[Stephen James]

It is simply the case whether the MS wants to spend the resources on generating 
the refreshes. 

If so, then it picks uas, if not, then uac. This could also be configurable on 
the MS as a preference, then the criteria is pushed to the user, who probably 
has no better criteria.

 
Stephen James 
sjames_1958 at yahoo.com
 
We are not princes of the earth, we are the descendants of worms, and any 
nobility must be earned.





________________________________
From: Sapan Vashishth <sapan.vashishth at gmail.com>
To: discussion at sipforum.org
Sent: Wed, June 20, 2012 6:02:41 AM
Subject: [SIPForum-discussion] session refresh parameter in response

Hi all 

How is the refresh mode selected to be  uas/ uac. 

For example if the invite to the (say media server) contains 
Supported: timer
Session-Expires: 100
and no refresh parameter, then how would the MS decide to the refresh mode be 
uac or uas. Is this decided on basis of some criteria?

since the rfc 4028 says

    UAC supports?  refresher parameter  refresher parameter                            
in request           in response        
-------------------------------------------------------              N                
none                 uas              N                uac                  NA              
N                uas                  NA              Y                none             
uas or uac              Y                uac                  uac              Y                
uas                  uas

so in case the UAC supports the timer and refresh parameter is none then the 
refresher parameter can be any of uac or uas. so who decides that value from the 
two.


BR
Sapan
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