Re: Last call: draft-montemurro-gsma-imei-urn-16.txt

[Andrew Allen <[e-mail]>]

Martin

Further to our conversation on this topic in Berlin I now respond formerly on the list. 

3GPP has defined the mobile terminal as performing the UA role since the very beginning of IMS. Therefore the mapping between the terminal and the instance ID in IMS is a one to one relationship. 

Andrew

----- Original Message -----
From: Martin Thomson [mailto:[e-mail]]
Sent: Monday, July 22, 2013 12:57 PM Central Standard Time
To: Andrew Allen
Cc: [e-mail] <[e-mail]>; [e-mail] <[e-mail]>
Subject: Re: Last call: draft-montemurro-gsma-imei-urn-16.txt

On 20 July 2013 15:34, Andrew Allen <[e-mail]> wrote:
> 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?

I think that reading this thread should provide you with ample reasons.

The instance ID in outbound has certain stability requirements that do
not strictly correspond to the lifetime of the hardware in use.  The
other use cases answer very different questions, which include: is
this a stolen device, is this device authorized to use the networks,
etc...   I'm certain those questions can be answered without a device
identifier traversing the network.

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