[SIPForum-discussion] session refresh parameter in response

[Santhosh B.N]

On receiving a Invite with refresher type parameter  as none the Media
server itself shall take care of refreshing the session and act as
refresher ----- hence the refresher will be UAS ---- with one exception as
below
If the Media server (or any UAS for that matter) is configured in such a
way that the server will never take the role of refresher but supports
session refresh and  wants the UAC from which the invite is received to be
refresher then the UAC will take the role of refresher, this happens when
refresher type on Media server/UAS is configured as "UAC"

     config on UAC       Config on UAS     Who takes the role of Refresher
 1) None                       none/UAS          UAS
 2) None                        UAC                 UAC

Thanks,
Santhosh



On Tue, Jun 19, 2012 at 7:49 PM, Sapan Vashishth
<sapan.vashishth at gmail.com>wrote:

> 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
>
> _______________________________________________
> This is the SIP Forum discussion mailing list
> TO UNSUBSCRIBE, or edit your delivery options, please visit
> http://sipforum.org/mailman/listinfo/discussion
> Post to the list at discussion at sipforum.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20120620/0e510656/attachment-0002.html>