> Hello,
>
> a new module is now on development branch, named msrp, offering an embedded
> MSRP relay. Message Session Relay Protocol is specified by IETF ( core and
> relay part in RFC4975 and RFC4976), one of typical use cases is Instant
> Messaging sessions negotiated via INVITE-200ok-ACK, a different approach
> than SIP MESSAGE request.
>
> There is no external dependency, the transport layer from core is reused to
> manage TCP/TLS connections used for MSRP. A MSRP relay is pretty much an
> independent node, thus you can run Kamailio just to deal with MSRP traffic.
> But there is no problem to run Kamailio to handle SIP and MSRP traffic in
> the same instance, same or different sockets (it is working even when
> SIP/MSRP are sent over the same connection or different connections to same
> port).
>
> I couldn't find a reliable and trustable open source SIP phone to test with
> it so far (hints are welcome), the module was tested with network tools and
> chaining Kamailio instances. Help with testing and feedback is very
> appreciated -- I can provide guidelines to adjust the config file to fit
> tester's needs, just contact me off list or via IRC channel.
>
> For the moment, the relation (user,session) management is done in the
> config, using htable module for example (see the README), it may be added
> inside the module for the future to make it easier overall, although is less
> than 10 lines of config -- this is mainly for extra security reasons, to
> check if the session id matches the connection that was opened when the
> session was created, otherwise the user authentication functionality is done
> reusing existing functions from auth module. Another benefit is
> performances, storing local socket and connection IP/port saves some time to
> lookup the connection.
>
> Building MSRP relay on top of SIP server was done first for the benefit of
> reusing the transport layer from the core for IPv4/IPv6 and TCP/TLS, which
> is mature, scalable and offers asynchronous communication. Besides that, you
> have most of the config tools to route SIP requests available for routing
> MSRP (authentication, authorization, IP checking, accounting, a.s.o.).
>
> I made a news post with more details:
>
> *
http://www.kamailio.org/w/2012/01/new-module-embedded-msrp-relay/
>
> The readme of the new module is available at:
>
> *
http://kamailio.org/docs/modules/devel/modules/msrp.html
>
> Cheers,
> Daniel
>
> --
> Daniel-Constantin Mierla --
http://www.asipto.com
>
http://linkedin.com/in/miconda --
http://twitter.com/miconda
>
>