[Freeswitch-dev] msrp support

Tue Jan 31 03:13:56 MSK 2012

Cool. I have moved msrp related applications and apis to msrp.c so it's more clear. Will do more work and update later.

Thanks. 

On Tuesday, January 31, 2012 at 1:59 AM, Anthony Minessale wrote:

> 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 (mailto: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 (http://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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> 
> 
> -- 
> Anthony Minessale II
> 
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