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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> Thu, 10 January 2019 17:25 UTC

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To: Christer Holmberg <christer.holmberg@ericsson.com>, "sipcore@ietf.org" <sipcore@ietf.org>
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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 1/10/19 12:09 PM, Christer Holmberg wrote:

>>What if the client supports multiple PNSs, and doesn't know which is
>>supported by this registrar and associated proxies? Can it indicate
>>support for multiple PNSs - allowing the proxies to choose which one to use?
> 
> The current pn-provider syntax does not allow it, but Adam suggested 
> that we should allow the UA to indicate support of multiple PNS.

That would help. Then, if more than one PNS is supported, but by 
different proxies, then IIUC:

- the request MAY get passed along to the first proxy that supports one 
of the named PNSs. It will take it and the others are not considered.

- OR, a proxy that supports a different PNS than any the client supports 
may reject the request without allowing a later proxy to accept it.

Do I have that right?

	Thanks,
	Paul

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