Which IP phone are you using? What codec are you using? What is the MOS score (low value)?

Have you tried a different browser?

This describes the steps to take when one of these problems occurs with agents in a Cisco IP Contact Center (IPCC) Express environment:specific agents do not display on a Cisco Supervisor Desktopagents disappear from the Cisco Supervisor Desktopthe S...

Yes, I think this is possible. I'd contact your local sales office. They should be able to set you up.

If the SysUpTime in masked in v1default view, Device Discovery does not discover the device. Workaround is to Manually add the devices to DCR. Or Remove the mask in v1 default view.