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](https://tools.ietf.org/html/rfc4976#section-11)
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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