[Twisted-Python] Media Resource Control Protocol (MRCP)

[David Pratt]

You may wish to look at divmod's sine project that provides an sip 
server. Why not license under MIT so that if this is successful it may 
become another a supported protocol in the twisted stack.

Regards,
David

Ivan Uemlianin wrote:
> Dear All
> 
> I am interested in writing an MRCP (Media Resource Control Protocol [1])
> server.  In particular I want to write an MRCP speech recognition
> resource server as part of my trefnydd [2] project.  I am posting here
> to ask for advice about the network programming part.
> 
> I shall also be writing an MRCP client (if only to test the server).
> All the code will be GPL'd.
> 
> As far as I understand it, an overview of the networking would go like
> this:
> 
> An MRCP session between client and server is initiated using the Session
> Initiation Protocol (SIP).  Client and server negotiate using SIP
> messages containing SDP message bodies to define the participants and
> the resources required in the session.  After session initiation, two
> channels are launched: a media channel using RTP to carry binary audio
> (i.e., speech) data, and a control channel using TCP (control channel
> messages are text-based and in MRCP format).
> 
> It seems to me that both client and server software would have to cope
> with SIP, SDP, RTP, MRCP (message format) and plain old TCP (for the
> SIP/SDP and MRCP control channel messages).
> 
> Here are my questions:
> 
> - Does anyone know of a FOSS project to write an MRCP server? preferably
> in python. I know of mrcp4j [3].
> - My first plan would be to make the MRCP client/server a subclass of an
> SIP client/server, as SIP is used to set up (and tear down) the session.
>  Does that sound sensible?
> - Can twisted.protocols.sip be used to write a SIP server?  Would it
> give me everything I need, or would I also need something like pjsip [4]
> or jain-sip [5] for the low-level stuff?
> - Have I missed anything?
> 
> Any advice would be gratefully received.  I'll report back with progress.
> 
> Best wishes
> 
> Ivan
> 
> [1] MRCP:  http://www.llaisdy.com/static/tech/mrcp/
> [2] trefnydd:  http://www.llaisdy.com/static/trefnydd/
> [3] mrcp4j: "MRCP4J provides a Java API that encapsulates the MRCPv2
> protocol and can be used to implement MRCPv2 clients and/or servers."
> http://mrcp4j.sourceforge.net/
> [4] pjsip:  http://www.pjsip.org/
> [5] jain-sip:  https://jain-sip.dev.java.net/
> 
> 
> 
> 
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