[SIPForum-techwg] Comments on 10.1 3 (Route header)

[Elwell, John]

David,

Looks good. However, we should change "header" to "header field"
throughout, in line with the rest of the document (a SIP message has a
single header and many header fields).

John 

> -----Original Message-----
> From: David Hancock [mailto:D.Hancock at CableLabs.com] 
> Sent: 21 April 2009 22:18
> To: Elwell, John; techwg at sipforum.org
> Subject: RE: [SIPForum-techwg] Comments on 10.1 3 (Route header)
> 
> 
> John,
> 
> Here is some proposed text that attempts to resolve your two comments
> below. 
> 
> I attempted to write this w.r.t. our reference architecture, where
> SIPconnect defines the requirements only for the interface between the
> SIP-PBX and SP-SSE, and doesn't say anything about the interfaces
> internal to the SP-SSE (for example). Therefore, the SP-SSE 
> requirements
> for inclusion of a Route header in out-of-dialog requests sent to the
> SIP-PBX on the SIPconnect interface apply only when the 
> SP-SSE receives
> a Path header from the SIP-PBX in a REGISTER request. 
> 
> These requirements don't apply for the case where the SP-SSE 
> receives a
> REGISTER request containing no Path header from the SIP-PBX, but the
> SP-SSE decides to add a Path header as the REGISTER traverses internal
> proxies on its way the Service Provider registrar. Does this line up
> with your/everyone's understanding?
> 
> Here's the text...
> 
> --------------------------------
> 
> 17.7	Routing Inbound Requests to the SIP-PBX
> 
> If the SP-SSE obtains path vector information from the SIP-PBX during
> registration of the Main Public Identity, then the SP-SSE 
> MUST include a
> Route header in any out-of-dialog request sent to the SIP-PBX, as
> described in RFC 3327. The SP-SSE MUST populate the Route header with
> the path vector information received from the SIP-PBX during
> registration, and append to it (as the bottom-most Route header entry)
> the SIP signaling address of the SIP-PBX. 
> 
>     Note, the SIP signaling address of the SIP-PBX is the 
>     Contact URI (including any associated URI parameters) 
>     that was bound to the called Main Public Identity when 
>     the SIP-PBX registered, as described in Section 17.4. 
> 
> The path vector information learned by the SP-SSE when the SIP-PBX
> registers the Main Public Identity applies to the implicitly 
> registered
> Alternate Public Identities as well. Consequently, the SP-SSE MUST
> support the Route header requirements defined in this section for
> out-of-dialog requests sent to the Main and Alternate Public 
> Identities
> of the SIP-PBX. 
>  
> A SIP-PBX receiving an out-of-dialog request containing a Route header
> field MUST ignore the route if the route identifies a local (SIP-PBX)
> contact address.
> 
> An example of the Route header field is shown below:
> 
> Route: sip:outbound.example.net
> 
> --------------------------------------
> 
> David
> 
> 
> > -----Original Message-----
> > From: techwg-bounces at sipforum.org 
> [mailto:techwg-bounces at sipforum.org]
> On
> > Behalf Of Elwell, John
> > Sent: Tuesday, April 21, 2009 1:52 AM
> > To: techwg at sipforum.org
> > Subject: Re: [SIPForum-techwg] Comments on 10.1 3 (Route header)
> > 
> > 
> > 
> > > -----Original Message-----
> > > From: Elwell, John
> > > Sent: 09 April 2009 14:25
> > > To: techwg at sipforum.org
> > > Subject: Comments on 10.1 3 (Route header)
> > >
> > > This seems to be solely to do with registration mode, so
> > > should it be moved to Annex A?
> > >
> > > In fact, should there be a sub-section of Annex A on the
> > > topic "Routing inbound requests to the SIP-PBX" and should
> > > this form part of it? I guess this relates to some existing
> > > open issues in 17.4.
> > [JRE] I see that this has been partly taken care of in v06. However,
> the
> > text concerned has been moved to 17.4.2, which is a 
> subsection of 17.4
> > (Registration). Since the text deals with INVITE requests (or more
> > specifically, new inbound requests), it really doesn't belong there.
> It
> > probably instead should be a new subsection 17.7 "Routing inbound
> > requests to the SIP-PBX", and the words should be 
> generalised to cover
> > any inbound request, not just INVITE.
> > 
> > 
> > >
> > > In the 3rd paragraph it states:
> > > "The SIP signaling address of the SIP-PBX is the Contact
> > > address (including any associated URI parameters) that was
> > > bound to the called Enterprise Public Identity when the
> > > SIP-PBX registered, as described in Section 17.4."
> > > Considering that the title of this subsection is "Route
> > > header", it is unclear from this wording what the relevance
> > > is. Should the contact address be added to the path vector
> > > and included in the Route header field?
> > [JRE] It is still unclear what is the significance of this 
> paragraph.
> > 
> > John
> > 
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