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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

Paul Kyzivat <pkyzivat@alum.mit.edu> Wed, 09 January 2019 17:06 UTC

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From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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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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On 1/9/19 10:28 AM, Christer Holmberg wrote:

>> 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.

	Thanks,
	Paul

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