Re: [Geopriv] Location in SIP and "retransmission-allowed"

From: Henning Schulzrinne ^lt;>
Date: Thu May 10 2007 - 10:49:21 EDT

I've said this before and I'll shut up after this since we have long
exceeded the point of diminishing returns, but I don't see where the
goals of privacy or the text of the document support your assertion.

I agree that by giving location to a URI, you authorize the URI to
perform a service. Thus, if you give your location to
urn:service:sos, you authorize that service. From a privacy
perspective, the protocols involved do not matter as long as the same
'party' is addressed, to quote 4119. After all, I assume you wouldn't
argue that a transition between UDP and TCP, or IPv4 and IPv6 in mid-
transit would make a difference; both are likely to occur in a SIP
call. (Indeed, you could even have, in the 911 I2 model, a transition
to delivery of location with a completely different protocol. Would
this require an override?)


On May 10, 2007, at 10:26 AM, Richard Barnes wrote:

> Henning,
> I certainly agree that our foundational documents are due for
> revision. However, until that revision is done, our work needs to
> be consistent with those documents, even the parts we'd like to
> revise.
> As to forwarding at layer 3: This seems like a valid distinction to
> me. Regardless of whether location is involved, by submitting a
> message for store-and-forward processing, the user implicitly
> authorizes the network to deliver that message to the proper
> recipients via necessary relays. In SIP, the recipients are UASs
> and the relays are proxies on the signaling path. This is the
> extent of the authorization.
> What a store-and-forward transmission does not do is authorize
> transmission outside the store-and-forward network, e.g., to LoST
> servers or Google Maps. This needs to be explicitly authorized (by
> something in the LO or by a tag in the header).
> --Richard

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