Make and answer phone calls Detect tone and pulse digit from the phone line Capture Caller ID Support blind transfer, single-step transfer/conference, consultation transfer/conference, hold, unhold. Control of the local phone handset

对通信原理中的2psk，2dpsk方式压缩解码进行仿真-Way of communication principle of 2 PSK, 2 DPSK compression decoding are simulated