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@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