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ZHENGZHOU YUXIN
 
There are many kind of PA1688 IP phones made by Yuxin, all use their own software slightly different from our standard reference design. However, the operation of those phones are almost the same with the standard design. More important is, those changes are known for us and related software changes are in our database all the time, so we can continue to provide updated software and fix known bugs. Typical examples:
YWH10.
YWH100.
YWH500.
The example in PA168V 1-port FXS gateway is also made by Yuxin.
After PA1688 discontinued, Yuxin used AR1688 for YWH201.