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Re: [sipcore] Alissa Cooper's No Objection on draft-ietf-sipcore-sip-push-21: (with COMMENT)

Christer Holmberg <christer.holmberg@ericsson.com> Fri, 11 January 2019 10:49 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Alissa Cooper's No Objection on draft-ietf-sipcore-sip-push-21: (with COMMENT)
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Date: Fri, 11 Jan 2019 10:48:59 +0000
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Subject: Re: [sipcore] Alissa Cooper's No Objection on draft-ietf-sipcore-sip-push-21: (with COMMENT)
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Hi,

So, how to move forward? Can I, or can I not, use "MUST … unless"?

Regards,

Christer


________________________________
From: sipcore <sipcore-bounces@ietf.org> on behalf of Christer Holmberg <christer.holmberg@ericsson.com>
Sent: Thursday, January 10, 2019 11:32 AM
To: Paul Kyzivat; sipcore@ietf.org
Subject: Re: [sipcore] Alissa Cooper's No Objection on draft-ietf-sipcore-sip-push-21: (with COMMENT)



Hi,

>> I can see why that specific "MUST... unless” may not be appropriate, given the
>> vagueness of the condition and the way we’ve constructed “MUST support/SHOULD use”
>> requirements for TLS in the past.
>
> But are you suggesting that conditional MUSTs are never appropriate?  I’ve been
> recommended “MUST ... unless...” constructions for cases where the MUST is true
> except in enumerated special cases. “SHOULD” doesn’t really accomplish the same
> thing, since a SHOULD as defined by 2119 allows for exceptions beyond those enumerated in the spec.

I would be fine with "SHOULD Y … unless X" - if X was the ONLY allowed exception for not doing Y.

But, as Paul suggests, people seem to have different opinions on that.

In any case, this is not SIP push specific, and should probably be discussed (once again...) elsewhere.

 Regards,

Christer

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