Subject: [Sipping] Re: draft-rahman-sipping-device-info-01.txt

From: Paul Kyzivat <[email-masked]>
Date: Fri, 05 Nov 2004 18:22:57 -0500

I'm not getting a clear understanding from this draft of what the 
granularity of a device is, or how you intend to address a device.

For example, lets assume I have a PC. On it I have two sip software 
agents: a softphone and an IM client. The softphone supports two "lines" 
(addresses), and the IM client supports a third address. For each of 
these addresses, there is an AOR, and a local contact that is registered 
with the corresponding AOR. The PC is behind a NAT, so it doesn't have 
stable contact addresses. So each time it registers, it requests a GRUU.

Summarizing:

PC IP address: 10.0.1.1

Softphone
- local sip address: 10.0.1.1:5060
- NATed address: 192.0.2.88:8866
- line 1
   - AOR: sip:[email-masked]
   - contact: sip:[email-masked]:5060;instance=id="uuid:stuff"
   - GRUU: sip:[email-masked];grid=1
- line 2
   - AOR: sip:[email-masked]
   - contact: sip:[email-masked]:5060;instance-id="uuid:stuff"
   - GRUU: sip:[email-masked];grid=2
IM client
- local sip address: 10.0.1.1:7654
- NATed address: 192.0.2.88:8872
- AOR: sip:[email-masked]
- contact: sip:10.0.1.1:7654;instance-id="uuid:something"
- GRUU: sip:[email-masked]

How does the device-info event package get used in this context?

- from your point of view, how many devices are there here?
- which of the above addresses can I use to invoke it?
   (Or do you imagine a separate "device address"?)
- does the answer I get depend on which address I use?
- should there be any tie between the data in the device info
   package and the instance-id used for GRUU?

	Thanks,
	Paul

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