3CX Client CTI mode - no dialing possible

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Daniel68

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Hello,
We use 3CX Phone for Windows v15.5.12227.5 in CTI mode. After the last software update on the phone system, dialing numbers with the Windows client does not work anymore. Nothing happens when pressing the "Call" button. Using the Web client, the message "no phone connected" appears.
3CX Server and phones are in the same LAN subnet.

On the management console we get a message, that our phone Yealink T28P are unsupported.
Just to be sure, is that the reason for the dialing problem with the 3CX client for Windows?
Unfortunately we have no other, still supported phone models to test.

System Information:
- License: Standard Perpetual 15.5.15502.6
- Phones: Yealink T28P, Firmware 2.73.0.60 (lastest available)

Any help is welcome. Thank's,
Daniel
 
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