Think I search way to transparently inject kamailio as MSRP proxy into SDP and MSRP messages.
Looks as this behavior will be not standard. But I expect this feature will allow inject kamailio as MSRP proxy when I not able to control caller UA.

SDP update
Could you looks RFC4976 Section 11. Example SDP with Multiple Hops

Here exist example

    c=IN IP4 bob.example.com
    m=message 1234 TCP/TLS/MSRP *
    a=accept-types: message/cpim text/plain
    a=path:msrps://relay.example.com:9000/hjdhfha;tcp  \
           msrps://bob.example.com:1234/fuige;tcp

Attribute a=path have two msrps uri.

I expect add kamailio msrp socket into a=path attribute.
Like Kamailio receive caller SDP like

    c=IN IP4 bob.example.com
    m=message 1234 TCP/TLS/MSRP *
    a=accept-types: message/cpim text/plain
    a=path:msrps://bob.example.com:1234/fuige;tcp

Then add msrps://relay.example.com:9000/hjdhfha;tcp \ at top of a=path and forwards to FreeSwitch (Asterisk) daemon.

And then make similar SDP update for 183 and '200' responses.

MSRP messages updates
Caller send

    MSRP 6aef SEND
    To-Path: msrps://b.example.net:9000/aeiug;tcp \
             msrps://bob.example.net:8145/foo;tcp
    From-Path: msrps://alice.example.org:7965/bar;tcp
    Success-Report: yes
    Byte-Range: 1-*/*
    Message-ID: 87652
    Content-Type: text/plain

    Hi Bob, I'm about to send you file.mpeg
    -------6aef$

Kamailio forward

    MSRP 6aef SEND
    To-Path: msrps://bob.example.net:8145/foo;tcp
    From-Path: msrps://b.example.net:9000/aeiug;tcp \
             msrps://alice.example.org:7965/bar;tcp
    Success-Report: yes
    Byte-Range: 1-*/*
    Message-ID: 87652
    Content-Type: text/plain

    Hi Bob, I'm about to send you file.mpeg
    -------6aef$

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