[Freeswitch-dev] msrp support

[Anthony Minessale]

If its only relevant to sip its ok to live in mod_sofia but it can
still be cleanly done.


On Mon, Jan 30, 2012 at 6:41 AM, Seven Du <dujinfang at gmail.com> wrote:
> UPDATE on MSRP
>
> As the lib is GPL and incomplete and it crashes when I test with blink, I
> thought it might be easier to write a simple implementation than debug the
> existing code.
>
> So I have the following code:
>
> https://github.com/seven1240/FreeSWITCH/commit/272607bf34d9748f20bd9e8082a1cf95b6f42e2d
>
> Please take a look and give some feedback so I can make progress.
>
> I followed RFC 4975 with some exceptions:
>
> 1) MSRP in FS is always passive, so clients behind NAT can easily connect to
> it
> 2) MSRP service only use one port(hardcoded to 8044 for now), so it's easy
> for firewall configs
> 3) MSRP always works in B2BUA way, perhaps we can add bypass_media or
> external MSRP relay later
> 4) MSRP payload is different than RTP anyway, so I added some apps like
> msrp_echo, msrp_send, msrp_recv and api like uuid_msrp_send etc.
> 5) Each session use one TCP connection, no duplex
> 6) Only support SDP have MSRP only, no mix of audio/videos
> 7) I tried with blink on Mac and Boghe on Windows, send messages and files
> with FS is sort of works with the above code. msrp_bridge is buggy but it is
> possible to send messages but not files for now.
>
> So I have new questions for the right way to do this:
>
> Current code is coupled in mod_sofia and ugly, but it need stub code into
> mod_sofia for SDP negotiation anyway, Ideally it should be a new mod_msrp to
> decouple from mod_sofia, but mod_sofia cannot call functions in mod_msrp I
> thought about the spandsp fax way but fax using RTP but MSRP using TCP so I
> don't now if it's possible.  Another idea would be put the msrp code into
> core, the advantage would be we have another media type in core so audio and
> MSRP data could be mixed in one SDP session.
>
> Ideas?
>
> Thanks.
>
> On Wednesday, December 7, 2011 at 10:11 AM, Seven Du wrote:
>
> http://jira.freeswitch.org/browse/FS-3748
>
> any other comments to my other questions? I think it would be  a mod_msrp
> and some msrp_glue.c things.
>
>
> Thanks.
>
> On Tuesday, December 6, 2011 at 11:49 PM, Brian West wrote:
>
> Submit this to jira.freeswitch.org and we can push things upstream.
>
> /b
>
> On Dec 6, 2011, at 12:08 AM, Seven Du wrote:
>
> Hi,
>
> We are working on msrp support in FS. With the following patch to lib sofia,
> the msrp SDP can deliver to mod_sofia
>
> http://pastebin.freeswitch.org/17944
>
> questions:
>
> 1) should I submit this to our jira or to the the sofia team? Any
> suggestions on the patch?
>
> 2) As FS is a B2BUA, so I think it would be endpoint-to-endpoint bridge,
> then we need start TCP/MSRP thread to handle media
>
> a. It should more like video handling or more like fax ? That means to hack
> bridge code to also handle msrp, or should we implement api like
> tx_fax/rx_fax vs tx_msrp/rxmsrp?
>
> b. for text over msrp, is it possible to routing the chatplan like mod_sms
>
> c. the first stage would be just endpoint to endpoint, shoud we implement
> relay ? or even switch mode for conference? I'm very new to msrp.
>
>
> 3) we found a msrp lib from http://confiance.sourceforge.net/ . It's GPL, I
> know it's not license compatible, but as I learned from previous talk about
> video, the code can put elsewhere and we just implement the logic to hook
> them on. Or other lib we could use?
>
>
> Any suggestion is appreciated.
>
>
> Seven.
>
> --
> About: http://about.me/dujinfang
> Blog: http://www.dujinfang.com
> Proj: http://www.freeswitch.org.cn
>
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>
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>
> 
> 
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-- 
Anthony Minessale II

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