hi Sourav,
As far i mine understanding , Refer with replaces is not a mandatory.

Regards
Abhishek

On Tue, Oct 28, 2014 at 5:25 PM, Vikas Dhiman <[email protected]>
wrote:

> Hi Sourav,
>
> Are you talking about Replace-to or Refer-To?
>
> In Refer-To replaces is not a mandatory parameter.
>
> Cheers,
> Vikas
>
> On Tue, Oct 28, 2014 at 4:35 PM, Sourav Dhar Chaudhuri <
> [email protected]> wrote:
>
> > Hi,
> >     Is this mandatory to have support for replaces parameter to support
> > REFER request?
> >
> >   Means If Supported: replaces is not present in the User Agent side .
> > Then that user will not support REFER request. The REFER request is
> > containing Replaces-to header having Replaces parameter. So in this case
> > the Use Agent will not support that REFER request?  is there any RFC
> > reference.. I have not got anything relevant in RFC 3515 for this.
> >
> > Thanks
> >
> > Sourav Dhar Chaudhuri
> > _______________________________________________
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> > [email protected]
> > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
> >
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