If you try to dial with a Hotkey, and nothing happens, perform the following checks:

 

Firstly check if you can dial with the Quick dialing option. If this is also not possible (the phone does not dial anything), check Outgoing Call - never possible.

 

If the phone dials, the Hotkey settings have to be modified:

 

•Try a Hotkey which is not used like CTRL+SHIFT+F10 - change the Hotkey here

•Especially in case the Hotkey is sometimes working and sometimes not, increase the Clipboard waiting time in increments of 10 - change the waiting time here