Re: [Geopriv] Suggested text for Section 3.6 ofdraft-ietf-geopriv-lo-retransmission

From: Thomson, Martin ^lt;Martin.Thomson@andrew.com>
Date: Tue Nov 18 2008 - 16:52:17 EST

I have no problem with this text.

> -----Original Message-----
> From: geopriv-bounces@ietf.org [mailto:geopriv-bounces@ietf.org] On
> Behalf Of Rosen, Brian
> Sent: Tuesday, 18 November 2008 1:54 PM
> To: GEOPRIV
> Subject: [Geopriv] Suggested text for Section 3.6 ofdraft-ietf-geopriv-
> lo-retransmission
>
> <note that in the following I use lower case "must". It's advice, we
> cannot use MUST. I think it's acceptable to be strong and use "must",
> rather than weasel-wording "any SIP document should consider
> compelling...">
>
> Back-to-back user agent behavior is often difficult to proscribe.
> There
> are many uses of B2BUAs and the rules that apply would depend on the
> actual use case. This section suggests what any SIP mechanism arising
> from this document might wish to consider with regard to B2BUA
> behavior.
>
> In most uses of B2BUAs, it is a simple intermediary between the nominal
> originating and nominal terminating UAs, that is, a proxy that does
> something proxies aren't allowed to do. In such cases, the B2BUA must
> conform to any new routing-allowed mechanism if it chooses an outgoing
> route. As this document advises proxies, <retransmission-allowed> does
> not apply and the B2BUA must copy the LI, the new routing-allowed and
> existing <retransmission-allowed> values.
>
> Where the B2BUA in fact does terminate the session, and originate
> another session, <retransmission-allowed> applies to it, and it must
> not
> copy location if <retransmission-allowed> is "no". If it chooses a
> route
> for the outgoing leg, any new routing-allowed mechanism applies to it.
>
> Encryption provides additional control to the originator on who is
> allowed to see location including B2BUAs. On the other hand, using
> encryption with LI which is needed for routing is problematic in that
> it
> is often difficult to know in advance which elements do location based
> routing. Similarly, using location-by-reference instead of
> location-by-value provides additional control to the originator over
> B2BUA behavior by controlling who can dereference. The same limitation
> for routing applies.
>
>
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