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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 17:09 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,


>>>That seems unfortunate. It may be that there is no single proxy
>>>implementation that supports all the different, while there might not be
>>>a single PNS that all the clients support. What is the deployment to do
>>>in that case? Deploying multiple proxies on the path, supporting
>>>different PNSs would be a solution. It wouldn't be too burdensome
>>>because only the chosen one would need to stay on the path.
>>>
>>>But apparently that option is currently not supported.
>>
>> Yes, it is. If a proxy receives a REGISTER with an indication of a PNS
>> that it does not support, the current solution DOES allow it to forward
>> the REGISTER request, if it "knows" that another proxy might support the
>> PNS.
>
>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.

Regards,

Christer

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