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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> Tue, 08 January 2019 12:50 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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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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Hi,


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.

>But that may or may not be true, depending on whether the device has gone to sleep

Implementations can of course do whatever they want, but I think it is bad design to specify such behavior. Unless the request will reach the UA, some re-transmissions will be "wasted", and once the proxy receives the REGISTER the re-transmission timer might have become rather big.

But, perhaps we could say something like:

"if the proxy has knowledge, or strong reasons to believe, that the UA is awake"

An example of such strong reason is that the proxy received the previous REGISTER just a few seconds ago.

Regards,

Christer


-Ekr


Regards,

Christer

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