Hi Aditya In register , UE will express its all capabilities lets say Volte call ,SMS over ip etc But when user initiate volte call using INVITE then only feature tag expressing volte call is added in contact header. This would help UAS to identify that calling application need to handle this INVITE and not SMS application .
Also Caller can express its preferences putting feature-tags in Accept-contact,reject contact header. Paul already mentioned about Feature-caps Thanks & regards Ankur Bansal On Mon, Feb 24, 2014 at 7:32 AM, Paul Kyzivat <pkyzi...@alum.mit.edu> wrote: > On 2/23/14 8:32 PM, Aditya Kumar wrote: > > Hi, > > What is the use of UE keeping feature-tags in Contact Header of INVITE? > > They indicate the features of the UAC at the time of the INVITE. > > One commonly used here is isFocus. > > > I see some UEs keeping. feature-tags in contact of REGISTER make > sense...not sure about having it in INVITE? > > also if UE wants why not it use "Feature-Caps "Header? I see as per rfc > only servers use this? > > Feature-Caps is explicitly intended for use when feature tags *cannot* > be used. > > Thanks, > Paul > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
