US business lines, six desk phones in total, phone model Polycom VVX311, one of them, the buttons one each side of the screen were down yesterday, no response when press them, I talked to the technical support, tried couple ways like reboot the phone, and so on, but still not working. And then, today, the second desk phone is down, but different buttons, this one, the home button, the mute button, and the lower volume button is not working. Tried to power off all the equipment including the phones and the network modems, and then started them again, still not working. Anybody knows what happened? It is really a weird issue which brings very big trouble to our daily business.
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