mod_spandsp already has the tone detection code, and has faxing code similar to what you describe.  It probably also has a good bit of the modem code you might need in libspandsp as well.

On Jun 25, 2013, at 12:24 PM, lists@collisters.com wrote:

I didn't get any response to my query about implementing a modem on freeswitch so I thought I would try to write one.
Excuse my ignorance/naivety but can anyone point me in the right direction for writing a module that can receive the RTP frames and decode them using my tone detection algorithm. and for taking my data and sending it back out via RTP frames/packets. 
Could I take an existing module, and use that as a template, I'm a good C coder but might struggle to start from scratch with FS in my timescales.
Any thoughts on where best to start this?

All the best,
Paul Collister paul@collisters.com

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