Hi,
The Supported header is used to convey that the UAC supports session 
timers. If the UAC supports Session timers, according to the RFC 4028 it 
is a MUST that Supported:Timer header be present. If the UAC does not 
support Session Timers but requires that the UAS support session timers, 
there should be a Required: timer header present in the request.
Regards
Nisha
SHIV SINGH wrote:
> Hi All,
>                I have a query about Supported header. Is it must to send  
> 'timer' tag extension in Supported: header if Session-Expire: 
> 60;refresher=uac/uas header is present in a request?
>    
>   Thanks & Regards,
>   Shiv Shankar
>
>                       
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