I used in a project, find the phone for a long time standards, DTMF, FSK, and Taiwan's standards

Packet : 93317427dtmf_fsk.zip filelist
来电显示标准/
来电显示标准/中国DTMF制式来电显示国标.pdf
来电显示标准/中国FSK制式来电显示国标.pdf
来电显示标准/台湾电信来电显示标准.pdf

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