[SR-Users] MSRP communication through Kamailio

[Peter Dunkley]

Hello,

If your client supports RFC 4975 for peer-to-peer MSRP then you will see
those attributes in the SDP.  That doesn't mean that the client supports
RFC 4976 MSRP relay.

Kamailio is an MSRP relay, not a B2BUA.  If you want MSRP B2BUA in Kamailio
you'd need to write a whole new module just for that.  However, Kamailio
isn't really the right architecture for a B2BUA.

If your client does not support RFC 4976 you aren't going to be able to use
it with Kamailio.  In this situation you will need some form of B2BUA
(probably an SBC) with MSRP support in it - and that probably means a
commercial product with a significant price attached.

Regards,

Peter



On 29 July 2013 12:45, Rajkumar Kanniappan
<rajkumar.kanniappan at sasken.com>wrote:

> Thanks Peter. So you mean to say kamailio doesnt support B2BUA for msrp
> communication?
>
> My client supports all the required MSRP SDP parameters and configurations
> are fine. Because I am able to see proper msrp headers in the initial
> INVITE.
>
>
> Thanks
>
>
> ________________________________________
> From: sr-users-bounces at lists.sip-router.org [
> sr-users-bounces at lists.sip-router.org] On Behalf Of Peter Dunkley [
> peter.dunkley at crocodilertc.net]
> Sent: Monday, July 29, 2013 16:34
> To: Kamailio (SER) - Users Mailing List
> Subject: Re: [SR-Users] MSRP communication through Kamailio
>
> There are two standards based options for MSRP.  Peer-to-peer between
> clients (RFC 4975) with no servers involved and traffic between clients
> relayed through a server (RFC 4976). RFC 4976 is used for NAT traversal and
> policy (security/logging/etc) enforcement.  The relay option requires the
> MSRP client to support additional MSRP request types, procedures, and SDP
> elements - essentially use of a relay requires the client to support this
> and be configured for it.
>
> There is a third option which is not standards based, that is B2BUA'ing
> MSRP where a server pretends to be a pair of clients back-to-back. This is
> what a lot of SBCs do.
>
> As a server that is not a B2BUA Kamailio supports MSRP relay as per RFC
> 4976.  However, your MSRP client needs to support RFC 4976 (and be
> correctly configured) to make use of the relay.
>
> Regards,
>
> Peter
>
>
>
>
> On 29 July 2013 11:20, Rajkumar Kanniappan <rajkumar.kanniappan at sasken.com
> <mailto:rajkumar.kanniappan at sasken.com>> wrote:
> Hi,
>
> Is it possible to make MSRP to pass through kamailio instead of peer to
> peer?
>
> For me, my sip client registers with kamailio without any problem and able
> to chat with other sip client as well.
> But the chat communication using MSRP is always peer to peer, because of
> the SDP negotiation. But I need make the msrp messages to pass through the
> kamailio server.
> Please help me in configuring the kamailio.
>
>
> Thanks
>
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> --
> Peter Dunkley
> Technical Director
> Crocodile RCS Ltd
>
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-- 
Peter Dunkley
Technical Director
Crocodile RCS Ltd
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