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Re: [sipcore] Eric Rescorla's Discuss on draft-ietf-sipcore-sip-push-21: (with DISCUSS and COMMENT) - the COMMENT issues - part 3

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 07 January 2019 19:47 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Eric Rescorla <ekr@rtfm.com>
CC: The IESG <iesg@ietf.org>, "br@brianrosen.net" <br@brianrosen.net>, "sipcore@ietf.org" <sipcore@ietf.org>, "draft-ietf-sipcore-sip-push@ietf.org" <draft-ietf-sipcore-sip-push@ietf.org>, "sipcore-chairs@ietf.org" <sipcore-chairs@ietf.org>
Thread-Topic: Eric Rescorla's Discuss on draft-ietf-sipcore-sip-push-21: (with DISCUSS and COMMENT) - the COMMENT issues - part 3
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Date: Mon, 07 Jan 2019 19:47:32 +0000
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Subject: Re: [sipcore] Eric Rescorla's Discuss on draft-ietf-sipcore-sip-push-21: (with DISCUSS and COMMENT) - the COMMENT issues - part 3
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Seems like I skipped one issue in my previous reply.


S 5.3.2.
>>
>>      If the proxy has knowledge that the UA is awake, and that the UA is
>>      able to receive the SIP request without first sending a REGISTER
>>      request, the proxy MAY choose to not request a push notification
>>      towards the UA (and wait for the associated REGISTER request and 2xx
>>      response) before it tries to forward the SIP request towards the UA.
>
>Why not race these?

One could do that, but I don't think it should be mandated.

>The current text prohibits racing if you *don't* know that the UA is awake.

The basic assumption of the mechanism is that a UA cannot receive SIP requests before it has received the push notification, sent the REGISTER etc.

Regards,

Christer

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