[SIPForum-discussion] diff between req URI & To header

[AMIT ANAND]

In a nut shell,

Request URI tell about immediate next receiver of the request and TO URI
tells about the actual receiver of the request or the party to whom this
call will actually go.

Although a B2BUA can rewrite any thing.

Thanks
Amit

On Mon, Jan 4, 2010 at 5:45 AM, M. Ranganathan <mranga at gmail.com> wrote:

> Or put another way:
>
> The To address is an Address Of Record. As a sip request is routed
> through multiple proxy servers from UAC to UAS, the To header is never
> re-written by the proxy server but the request URI address can be
> re-written.
>
> Notice that a Back To Back user agent can re-write anything it wants to.
>
>
> On Sun, Jan 3, 2010 at 2:47 AM, Nitin Kapoor <nitinkapoorr at gmail.com>
> wrote:
> > Mrinal,
> >
> > The To header field identifies the original recipient of the request
> > designated by the user identified in the From field. The original
> recipient
> > may or may not be the UAS processing the request, due to call forwarding
> or
> > other proxy operations.
> >
> > However, the Request-URI identifies the UAS that is to process the
> request.
> >
> > And according To RFC..
> >
> > Request-URI
> >
> > The Request-URI is a special form of SIP URI and indicates the resource
> to
> > which the request is being sent, also known as the
> > request target
> >
> > TO Header
> >
> > The To header field is a required header field in every SIP message used
> to
> > indicate the recipient of the request. Any responses generated by a user
> > agent will contain this header field with the addition of a tag.
> >
> >
> > Thanks,
> > Nitin Kapoor
> >
> > 2010/1/1 mrinal k <mrinal.80 at gmail.com>
> >>
> >> Hello everybody,
> >> Can anybodty pls tel me the diff between Request  URI & To header?
> >>
> >>
> >> thanks
> >> Mrinal
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>
>
>
> --
> M. Ranganathan
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