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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> Thu, 10 January 2019 17:35 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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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,

>>>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.

Correct.

>- 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.

Correct.

>Do I have that right?

Yes.

That is also what the current procedures say. However, they only talk about the UA indicating support of a single PNS, so we would need to change that to allow the UA to indicate support of multiple PNS.

Regards,

Christer



        Thanks,
        Paul

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