Martin There are obviously always alternative design choices but why would you want to include both a pre assigned device ID and a generated device ID in the same message? Andrew ----- Original Message ----- From: Martin Thomson [mailto:martin.thomson@xxxxxxxxx] Sent: Friday, July 19, 2013 11:25 AM Central Standard Time To: Andrew Allen Cc: tbray@xxxxxxxxxxxxxx <tbray@xxxxxxxxxxxxxx>; ietf@xxxxxxxx <ietf@xxxxxxxx> Subject: Re: Last call: draft-montemurro-gsma-imei-urn-16.txt On 19 July 2013 08:38, Andrew Allen <aallen@xxxxxxxxxxxxxx> wrote: > > I suggest you also read > http://datatracker.ietf.org/doc/draft-allen-dispatch-imei-urn-as-instanceid/ I read that document. The placement of IMEI in the instance id is a little bit of a non-sequitur to my thinking. There are three cases identified where it might be necessary to convey an IMEI, but no real motivation is provided for why it has to be included, specifically, in the instance ID. Nor is it the case that all of these cases necessarily require that IMEI is conveyed in the clear. I can imagine solutions to the real problems that do not require that an IMEI transit the network. However, I'll concede that the relationship between a network provider and the devices that use the network does not necessarily grant those devices any right protections of the form in which Tim seems to be assuming to be necessary. The real risk here is with scope of use. I'd have thought that a P- header would have been more appropriate for these use cases. --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.