I queried this some time ago, but I don't think anyone made it.
It exist a library in C++ that is a good wrapper for TSP (TAPI Service Provider) that is open source- it's a one-man-show in US somewhere, but this source is the same that's used by companies like Nortel/Avaya.
It's a job to integrate this with FreeSwitch, but it's doable + you can always ask if Mark Smith is interested to assist.
> Date: Wed, 23 May 2012 08:28:35 -0400
> From: vipkilla@gmail.com
> To: freeswitch-dev@lists.freeswitch.org
> Subject: Re: [Freeswitch-dev] FreeSWITCH / TAPI driver (using ESL)
>
> Found this but there is no source code:
> http://code.google.com/p/guicrm/
>
> I'd keep an eye on it.
>
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