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Re: [sipcore] Adam Roach's Discuss on draft-ietf-sipcore-sip-push-21: (with DISCUSS and COMMENT) - the DISCUSS issues Part 2

Christer Holmberg <christer.holmberg@ericsson.com> Wed, 09 January 2019 17:24 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] Adam Roach's Discuss on draft-ietf-sipcore-sip-push-21: (with DISCUSS and COMMENT) - the DISCUSS issues Part 2
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Date: Wed, 09 Jan 2019 17:24:17 +0000
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Subject: Re: [sipcore] Adam Roach's Discuss on draft-ietf-sipcore-sip-push-21: (with DISCUSS and COMMENT) - the DISCUSS issues Part 2
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Hi,

>>> I think you need a different discovery mechanism here -- either have 
>>> one that has the client offering multiple PNS protocols and the proxy responding with one, or have one in 
>>> which the proxy indicates all of its supported services in a response, and the client chooses one to use in its next REGISTER message.
>> 
>> I suggest the first option, where the client can offer multiple PNS protocols (pn-provider values) and the proxy responds with one.
>
> There could be a situation where there are multiple proxies on the path, each supporting a different mechanism. 
> Then what happens? Does the first proxy "win", or the last one?
>
> If this starts with the proxies each indicating their support, then the client gets to choose the one he prefers. This also 
> means the client doesn't need to include any additional information until it knows that it will be supported. Of course this 
> requires a double registration at startup, but considering the number of register requests that will be used during the session 
> this doesn't seem a huge burden.

If a proxy has indicated support of push, another proxy should not do it. The current syntax doesn't allow it.

Also, I am not aware of any scenario where there would be multiple proxies supporting push, so I don't think it is a real-life issue. Even if a network support multiple PNSs, they will all be handled by the same proxy.

Regards,

Christer

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