I need a DTMF to FSK decoder to allow the CX93010 chipset based modem supports caller id in some countries that have DTMF CID. The PCB must have an line in and a output line to be connected to the modem. There are others small requirements like format, pins and sockets required. The PCB should be smaller as possible.
The project should be tested.
The board should have a maximum 50x20mm.