[SIPForum-discussion] Regarding Route Header

SIP Babie sipbabie at gmail.com
Wed Jun 10 09:20:29 UTC 2009


Thanks Tomasz for the reply.

I am still not very clear. It will be great if you or any other member of
the forum explain this difference with example. I will really appreciate if
diagramatic explanation will be provided where 2 or more proxies with 2 UAC
are taken into example.


On Wed, Jun 10, 2009 at 1:45 PM, Tomasz Zieleniewski <
tzieleniewski at gmail.com> wrote:

> Hi,
> Route header is used by UAC cores (initiator of the request) to force
> downstream request
> routing, through the provided list of intermediary nodes. For for instance
> outbound SIP Proxy
> mechanism.
> The Record-Route header is inserted into the dialog creating requests by
> intermediate
> nodes (proxies) to force future requests sent within this dialog to be
> routed through this set of proxies,
> so called "route set". Ofcaurse if there are no Record-Route headers route
> set is empty.
> Route set is established during dialog creation and it can not be changed
> later on
> during further dialog transactions. When UAS receives initial dialog
> creating request with a list of
> Record-Route headers it constructs a route set and any further request sent
> within this dialog will
> initially contain a list of Route headers build from the previously
> received Record-Route list.
> Similarly UAC but in this case UAC will receive a route set in the dialog
> creating response (both early and final).
> Any further request sent by UAC  within this dialog will initially contain
> a specific list of Route headers.
> So usage of Route header is a general behaviour compliant with RFC3261
> called loose routing,
>  and Record-Route mechanizm simply utilizes the Route header functionality.
> Kind regards,
> -Tomasz Zieleniewski
> 2009/6/9 SIP Babie <sipbabie at gmail.com>
>> Hi All,
>> I am  newbie to SIP.
>> I will like to know the whats the difference between Route & Record-Route
>> header?
>> And also whats the significance of Route header.
>> I know Record-Route header is been added by proxies, so that all the
>> further SIP messaging will be passed via
>> proxies after an initial INVITE. I would like to know who adds Route
>> header and how Route header are been manipulated by proxies.
>> Regards,
>> babie
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