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

[mark lee]

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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