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

[debjit basu]

In otherway:

A SIP Proxy (statefull) can legitimately modify following these header
fields.

*Request URI*
Via
Record Route
Route
Max-Forwards
Proxy-Authorization.

But not *"To"* header.

Only exception is B2BUA.

Regards
Debjit

On Mon, Jan 4, 2010 at 8:39 AM, AMIT ANAND <amiit.anand at gmail.com> wrote:

> 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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>> >
>> >
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>>
>>
>>
>> --
>> M. Ranganathan
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>
>
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