[sr-dev] Registering a SIP TLS ALPN

[Sergey Safarov]

I see some registered names contains protocol version.
May need use "sip/2" as registered name?

https://medium.com/geekculture/exploring-application-layer-protocol-negotiation-alpn-c47b5ec3b419

On Wed, Aug 18, 2021, 2:09 PM Olle E. Johansson <oej at edvina.net> wrote:

>
>
> On 18 Aug 2021, at 11:59, Sergey Safarov <s.safarov at gmail.com> wrote:
>
> Why not register "msrp" extension in this draft?
>
> Simply because I personally did not need it. But you are right, we do have
> an MSRP module that can share the same port, very much like XHTTP.
>
>
> Also I think we need customer extension support here.
> Via TLS we can send Kamailio DMQ messages.
> Generally we can use "sip" extension, but user defined will be more
> accurate.
>
> Say we can define extensions prefix "user-defined-“
>
> I will have to go back to the ALPN rfc and check if there’s any mention of
> user-defined. THat would propably be a larger addition to the ALPN
> function, so it would require a full RFC publication.
>
> Thanks for the feedback!
> /O
>
>
>
> On Tue, Aug 17, 2021, 6:46 PM Olle E. Johansson <oej at edvina.net> wrote:
>
>> Hi Kamailians!
>>
>> I’ve written a very short IETF draft in order to register a SIP TLS ALPN:
>> https://datatracker.ietf.org/doc/draft-johansson-sip-alpn/
>>
>> An ALPN is a short code used in TLS connection setup to inform the server
>> of the “next protocol” after TLS connection is setup. This way, a server
>> listening to a port, like 5061 and 443, can support multiple protocols on
>> the same port.
>>
>> In Kamailio, we support HTTP 1 and SIP because they’re very much alike,
>> but if there’s a need to support other protocols it will be hard, like
>> MSRP. With ALPN support we could when using TLS.
>>
>> In addition, newer versions of HTTP will be harder to support using the
>> same parser. ALPN makes it easier.
>>
>> I do hope the registration will come through. If so, maybe we can discuss
>> what’s needed to support ALPN for SIP and HTTP in the TLS code.
>>
>> Cheers,
>> /O
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