As a Japanese Enterprises in Shanghai China, We installed the free version zoiper App to 70 Android mobile phones. Like the Wi-Fi phone. the wireless router is CISCO.
Now the sound quality is so poor, with a big noise, and intermittent signal.
If we used the same zopier App in the iPhone , the sound quality is quite good.
We want to know whether the problem could be solved perfectly, when we use the paid version.
Does the Zoiper have the Technical Department in Shanghai China?
If not ,we how to buy the paid APP version for android in ShangHai China.
Please help me to solve the problem ASAP.
Thanks in advance!