You are the best , I saw your post for decoding DTMF that was most accurate one that I tested.
In my country most of the PSN are using FSK for CID but I need it for work office that is located in an industrial area which uses an Old Siemens call center that is configured in DTMF for CID.
I look for a way to log caller ids of my phone to my computer. At first I tried dial-up modems such as USB CX93010 but after I red your post and listening to CID signal I found out it is sending in DTMF and after months of digging ,I gave up it seams dial-up modems does not support DTMF CID decoding.
So I decided to make a device and connect it to my computer.
I will try your lib too.
Thanks a lot