In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Coriolis wrote:

You cannot directly attach a telephone to the SX, they are designed to work on voltages that the SX cannot handle, you will need an interface. 
 

Here are two application notes regarding DTMF decoding:

[url=http://www.parallax.com/dl/appnt/sx/An19DtmfSilab.pdf]http://www.parallax.com/dl/appnt/sx/An19DtmfSilab.pdf[/url]

[url=http://www.parallax.com/dl/src/prod/sx/Dtmf.zip]http://www.parallax.com/dl/src/prod/sx/Dtmf.zip[/url]

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