[SIPForum-discussion] RE: 回复： Re: [SIPForum-discussion] 回复： Re: Which one maintain the route information in SIP, transaction layer or IP layer?

[Peili Xu]

Hi, Mark,

Loose route in SIP means the Proxy will not change the
Request-URI and just forward the message according to
Route header (if exist). The routing information is
carried by Route header and Contact header itself. It
has nothing to do with IP layer.

Hope this clarifies.

Peili


  _____  

From: mark lee [mailto:gogofly_lee at yahoo.com.cn] 
Sent: Tuesday, September 04, 2007 10:04 AM
To: Peili Xu; sip sip
Subject: 回复： Re: [SIPForum-discussion] 回复： Re:
Which one maintain the route information in SIP,
transaction layer or IP layer?


Hi,Peili:
If SIP signal is routed wiith strict route rule, it's
easy to understand why the application layer can
maintain the route information, but in loose route case,
here maybe have many additional hops between two hop,
who will maintain these addtional route information? my
thought is IP layer,right?
 
Thanks
Mark

Peili Xu <xupeili at huawei.com> 写道：

Hi Mark,

Although similar at abstract level, SIP strict route and
loose route
are different concepts from IP route. You can find
definition of
strict route&loose route in rfc3261.

regards.
Peili

在 07-9-3，mark lee 写道：
> Hi,Peili:
> In the IP pocket, strict route or loose route item can
be located in the IP
> header for pocket routing, in the SIP, strict route or
loose route is also
> used by SIP signal,but it's used by different layer, I
want to know: is the
> strict route/loose route of SIP same as the strict
route/loose route of IP
> header? or the strict route/loose route of SIP is a
new item which is only
> used by SIP route?
>
> Thanks
> Mark
>
> Peili Xu 写道：
> Hi Mark,
>
> Could you please clarify what do you mean by saying
"route information"?
> route-set?
>
> Peili
>
> 在 07-9-3，mark lee 写道：
> > Hello, everyone:
> > As you know, SIP defines strict route and loose
route, could you tell me
> > which layer should maintain the route information in
couple of cases,
> > transaction layer or IP layer?
> >
> > Thanks a lot
> >
> > Mark
> >
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