Note that Supported talks about what the *sender* of the message
containing it supports. Require talks about what the *recipient* of the
message containing it (must) support.
For some options its possible that only one side need support the
option. For others that makes no sense. (One where it does make sense is
"timer".)
As a result, there is no implied linkage between the two. Put in
Supported if *you* support it, and put in Require if you require that
the *other guy* support it.
Paul
Sourav Dhar Chaudhuri wrote:
> Hi,
> I have a doubt is it mandatory to haveSupported:100rel in INVITE
> request while it already contains Require:100rel inINVITE.
>
> 2. One more question is it possible that a Caller cannot sendPRACK for a
> Reliable Provisional Response(RPR) as it contains Require:100relbut no
> Supported:100rel in its INVITE request.
>
> I am asking the second question because if that thesame capability is
> present in Callee so whether after receiving any INVITEwith Require:100rel ,
> whether callee will be not be able to send RPR.
>
> Thanks
> SOURAV DHAR CHAUDHURI
>
>
>
>
>
>
>
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