[sr-dev] Registering a SIP TLS ALPN

[Olle E. Johansson]

> 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 <mailto: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/ <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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