It’s main purpose, as listed here, is to implement file transfer functionality through SIP (with the usage of MSRP) in Jitsi (ex sip-communicator) open source client.
This was achieved using what is currently now RTF 5547 (and at that time was simply a draft)
The original code is available here.
Click here to get more info on how to access the SVN repository.
If you have any questions, or you are interested in further developing this feature, please contact me.
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