> On 13 Jul 2021, at 10:10, Christer Holmberg 
> <[email protected]> wrote:
> 
> Hi Olle,
> 
> When you say “does not support Outbound”, are you referring to the whole 
> mechanism, or to the specific 
> reuse-of-registration-connection-for-incoming-calls part?

We have had a lot of discussions about this in the past, where I focused on the 
latter. In the current set of standards a server is not allowed to reuse the 
incoming TLS connection for outbound requests. Only SIP outbound allows this. 
That’s why I started a discussion about a “half-outbound” - much like the use 
of Outbound in SIP over WebSockets today.

Here’s some notes and ideas on that from 2016:
https://www.slideshare.net/oej/sip-half-outbound-random-notes 
<https://www.slideshare.net/oej/sip-half-outbound-random-notes>

/O
> 
> Regards,
> 
> Christer
> 
> Get Outlook for iOS <https://aka.ms/o0ukef>
> From: stir <[email protected]> on behalf of Olle E. Johansson 
> <[email protected]>
> Sent: Tuesday, July 13, 2021 9:32:56 AM
> To: Roman Shpount <[email protected]>
> Cc: [email protected] <[email protected]>; Mary Barnes <[email protected]>; 
> Salz, Rich <[email protected]>; [email protected] <[email protected]>
> Subject: Re: [stir] [Acme] NYTimes.com: How Do You Stop Robocalls?
>  
> 
> 
>> 13 juli 2021 kl. 06:58 skrev Roman Shpount <[email protected] 
>> <mailto:[email protected]>>:
>> 
>>  At the same time, SIP over TLS has many performance and reliability issues 
>> that would need to be addressed before it is ready for industry-wide 
>> deployment.
> 
> There’s also a lack of applicable standards for TLS usage, as I’ve pointed 
> out a few times, but the working group seems to have no energy to fix. SIP 
> over TLS from the SIP phone side requires implementation of SIP outbound, 
> which we never successfully tested at any SIPit. I know of a few 
> implementations now, but haven’t tested them together.
> 
> Made this presentation five years ago
> https://www.slideshare.net/oej/sip-tls-security-in-a-peer-to-peer-world 
> <https://www.slideshare.net/oej/sip-tls-security-in-a-peer-to-peer-world>
> 
> /O
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