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Re: [Dime] RFC4006bis - Subscription-Id-Extension AVP

"Gardella, Maryse (Nokia - FR)" <maryse.gardella@nokia.com> Tue, 24 January 2017 15:25 UTC

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From: "Gardella, Maryse (Nokia - FR)" <maryse.gardella@nokia.com>
To: Yuval Lifshitz <ylifshitz@sandvine.com>, "dime@ietf.org" <dime@ietf.org>
Thread-Topic: RFC4006bis - Subscription-Id-Extension AVP
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Date: Tue, 24 Jan 2017 15:25:21 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dime/GJv2QmxchWm8Rgioo-HT7vDPv9g>
Subject: Re: [Dime] RFC4006bis - Subscription-Id-Extension AVP
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Hi Yuval,

Thanks for continuing on this.
I am not sure to understand the difference between "may" and "must", since with  "May" we can end having the M-bit set by the RFC4006bis CC client.
I guess from the protocol's perspective "may" and "must" makes no difference right?

BR
Maryse

From: DiME [mailto:dime-bounces@ietf.org] On Behalf Of Yuval Lifshitz
Sent: vendredi 13 janvier 2017 15:24
To: dime@ietf.org
Subject: [ALU] [Dime] RFC4006bis - Subscription-Id-Extension AVP

Hi All,
As part of the RFC4006bis work there are several AVPs that we plan on making future proof (See also: https://trac.ietf.org/trac/dime/ticket/95). For example, Subscription-Id AVP cannot be extended to new types without changing the enumeration in Subscription-Id-Type AVP, which in turn requires a new application ID (something we really want to avoid).
To solve this issue we propose adding a new, extendable AVP. In this example:

Subscription-Id-Extension ::= < AVP Header: XXX >
                             [ Subscription-Id-E164 ]
                             [ Subscription-Id-IMSI ]
                             [ Subscription-Id-SIP-URI ]
                             [ Subscription-Id-NAI ]
                             [ Subscription-Id-Private ]
                            *[ AVP ]

When looking into Subscription-ID-Extension AVP  header flags I ran into a problem. The existing Subscription-ID AVP (and its sub-AVPs) are all marked with the M-bit as a "must", probably because they hold the subscriber's name which is critical information.
However, in order for a RFC4006bis CC client to be able to communicate with an RFC4006 CC-server, they will have to be marked as "may".

Would appreciate your point of view on that topic?

Best Regards,

Yuval

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