Accoustic coupler for MC1000

I have a customer using the Telxon PTC610 which has an integrated accoustic coupler for data communications.  They would like to port the TCAL application running on the PTC610 to the MC1000, but need to keep the accoustic coupler connection.  Has anyone tested a coupler device from Konexx(http://www.konexx.com/products/koupler/index.html?ss=field  on any of our devices?  Does it provide the data connection similar to the PTC610?  If not, any recommendations on other coupler devices? 

Thanks,

Ken