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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 15:35 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 4:27 AM, Christer Holmberg wrote:

>>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?

	Thanks,
	Paul

> But, some operators do not want the REGISTER to reach the registrar if 
> no proxy supports the PNS.
> 
> So, an operator can configure its network to act in a desired way.
> 
> Regards,
> 
> Christer
> 
>

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