[SIPForum-discussion] session refresh parameter in response

[Sapan Vashishth]

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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